[collectd.git] / ChangeLog

2016-11-28, Version 5.5.3
        * collectd: Write threads are stopped before shutdown callbacks are
          called. Thanks to Florian Forster. #1110
        * collectd: A compile error on AIX has been fixed: "MSG_DONTWAIT" is not
          available on AIX. Thanks to Chao Yang.
        * libcollectdclient: Lines printed to "STDERR" are now guarded by the
          environment variable "COLLECTD_TRACE". Thanks to Florian Forster. #105
        * collectd.conf(5): Various typos have been fixed. Thanks to Marc
          Fournier.
        * Build system: Detection of the Java environment has been made
          deterministic to allow for reproducible builds. Thanks to Marc
          Fournier. #1523
        * APC UPS plugin: Unavailable metrics are now skipped instead of
          reported as 0 (zero). Thanks to Florian Forster. #2025
        * Battery plugin: The minimum value has been removed from the power type
          to allow the plugin to report discharging batteries as negative power.
          Thanks to Florian Forster.
        * DBI, Oracle and PostgreSQL plugins: An error message when the type
          instance is truncated has been added. Thanks to Florian Forster. #4
        * cURL-JSON plugin: A possible segmentation fault when parsing
          unexpected JSON has been fixed. Thanks to Florian Forster. #1896
        * DF plugin: Compilation with xfsprogs ≥ 4.7.0 has been fixed. Thanks
          to Thomas Deutschmann. #1877
        * Modbus plugin: Build issues on FreeBSD have been fixed. Thanks to
          Florian Forster.
        * Network plugin: An error message has been corrected. Thanks to Florian
          Forster.
        * Network plugin: Handling of errors form secure memory initialization
          has been improved: the plugin fails gracefully now instead of calling
          "abort()". Thanks to Sebastian Harl.
        * Network plugin: The gcrypt library is only initialized when it is
          actually required due to the network plugin's configuration. Thanks to
          Florian Forster. #1902
        * Ping plugin: The init callback has been changed to be idempotent,
          fixing errors being reported on Solaris. Thanks to Florian Forster.
          #869
        * PostgreSQL plugin: The query_plans and query_plans_by_table queries
          have been improved to return 0 (zero) instead of "NULL" when not
          available. Thanks to Bernd Zeimetz. #1905
        * PowerDNS plugin: The "recursor command" has been fixed so PowerDNS can
          correctly parse all requested fields. Thanks to Ruben Kerkhof.
        * Python plugin: Handling of data sets with multiple data sources of
          different type has been fixed. Thanks to Sebastian Harl.
        * RRDCacheD plugin: Reconnection behavior after failed operations has
          been added. Thanks to Sebastian Harl. Debian#657877
        * Write Graphite and AMQP plugins: A bug that could lead to a missing
          null-termination has been fixed. Thanks to Markus Linnala.
        * Write Kafka plugin: Support for librdkafka 0.9.0 has been added.
          Thanks to Florian Forster.
        * Write Riemann plugin: Build issues on Solaris have been fixed. Thanks
          to Florian Forster.

2016-07-25, Version 5.5.2
        * collectd: A division by zero has been fixed in the
          "plugin_dispatch_multivalue()" function. Thanks to Corey Kosak.
        * collectd: The address of the Free Software Foundation has been fixed
          in GPL license headers. Thanks to Ruben Kerkhof.
        * Build system: Detection and handling of librrd 1.6 and later has been
          fixed. Thanks to Ruben Kerkof.
        * Apache plugin: A warning about a possible misconfiguration has been
          added. Thanks to Marc Fournier.
        * cURL, cURL-JSON and cURL-XML plugins: A memory leak when allocating
          more memory fails has been fixed. Thanks to Brandon Arp.
        * DF plugin: A build issue on DragonFlyBSD has been fixed. Thanks to
          Ruben Kerkhof. #1575
        * Ethstat plugin: Code to strip leading whitespace from device names.
          This works around an issue in the VMXNet3 driver. Thanks to Thomas
          Guthmann. #1059
        * Exec plugin: A problem in the error handling of an fdopen() failure
          has been fixed. Thanks to @ciomaire.
        * Modbus plugin: The debug output has been disabled by default. It is
          now only enabled when building with "--enable-debug". Thanks to Eric
          Sandeen and Marc Fournier.
        * Network plugin: A check for the initialization of secure memory has
          been added. Previously, failure to initialize this memory was
          ignored. Thanks to @yujokang. #1665
        * Network plugin: A heap overflow has been fixed in the server code.
          This issue can be triggered remotely and is potentially exploitable.
          Thanks to Emilien Gaspar. CVE-2016-6254
        * Perl plugin: Init callbacks have been changed to run essentially
          single-threaded to avoid race conditions by init functions which
          create additional threads. Thanks to Pavel Rochnyack. #1706
        * Processes plugin: A warning about too long process names has been
          added. Thanks to Marc Fournier. #1284
        * Redis plugin: A memory leak in an error handling code path has been
          fixed. Thanks to Andrés J. Díaz.
        * Redis plugin: The data source type of the expired_keys metric has been
          corrected to "DERIVE". Thanks to Marc Falzon and Marc Fournier. #1483.
        * SMART plugin: A build dependency on libudev has been added. Thanks to
          Pavel Rochnyack. #1724
        * StatsD plugin: A deadlock on plugin shutdown has been fixed. Thanks to
          Pavel Rochnyack #1703
        * Write HTTP plugin: Freeing of memory holding HTTP headers during
          shutdown has been fixed. Thanks to Tolga Ceylan.
        * Write Sensu plugin: A segfault when the Tag was unset has been fixed.
          Thanks to Marc Fournier.
        * ZFS ARC plugin: The cache_operation-stolen metric has been removed for
          FreeBSD 10.2 and later. Thanks to Ruben Kerkhof. #1580

2016-01-22, Version 5.5.1
        * Build system: Compilation errors have been avoided by correctly
          defining package name and version used by autoconf. Thanks to Nathan
          Berkley. #1063
        * Build system: Dependency ordering was fixed to ensure parallel builds
          work reliably. Thanks to Gustavo Zacarias. #1125
        * Build system: Error messages have been improved and building the unit
          tests has been fixed on Solaris. Thanks to Florian Forster and
          Dagobert Michelsen. #1077
        * Build system: The move of the "utils_ignorelist" functions has been
          reverted. This fixes build issues of numerous plugins. Thanks to
          Benjamin Drung;. #1323
        * Build system: The fhcount plugin has been restricted to Linux. Thanks
          to Ruben Kerkhof. #1195
        * Build system: Detection of header files for the turbostat plugin has
          been fixed. Thanks to Marc Fournier. #1075
        * collectd: The "LC_NUMERIC" locale is now forced, to prevent issues
          with some plugins on environments using a comma as decimal separator.
          Thanks to Florian Forster. #1237
        * Documentation: Some precisions related to the virt plugin have beed
          added. Thanks to Wojtek Bocer and Ruben Kerkhof.
        * Documentation: The CollectdInternalStats documentation has been
          improved. Thanks to Yves Mettier and Florian Forster.
        * Battery plugin: A missing Type has been added. Thanks to Marc
          Fournier. #1338
        * Bind plugin: An off-by-one error has been fixed: an index was checked
          against a wrong variable, which may lead to an out-of-bounds read.
          Thanks to Michal Humpula. #1123
        * Ceph plugin: JSON parsing has been refactored to support ceph 10.0.0
          and fixes several buffer overflows. Thanks to Florian Forster. #1350
        * CPU plugin: A Mac OS X specific bug has been fixed: the plugin
          expected an incorrect number of CPU states, resulting in failing read
          callbacks. This regression was introduced in 5.5.0. Thanks to Robert
          Viduya.
        * Disk plugin: Support for Mac OS X 10.10 has been added. Thanks to
          Robert Viduya. #1065
        * IPC plugin: Support for building with musl-libc has been added. Thanks
          to Natanael Copa. #1147
        * Log Logstash plugin: A segfault when using libyajl, version 1 was
          fixed. Thanks to Vincent Bernat. #1190
        * Log Logstash plugin: The timestamp is now ISO 8601 compliant. Thanks
          to Marc Fournier. #1132
        * memcached plugin: The Type of the listen-disabled metric was fixed.
          Thanks to Florian Forster. #1356
        * MySQL plugin: The Type used by Innodb_buffer_pool_pages_flushed was
          fixed. Thanks to Marek Becka. #1085
        * OpenLDAP plugin: A crash when using LDAPI (LDAP-over-IPC) got fixed.
          Thanks to Marek Becka. #1080
        * OpenLDAP plugin: Support for Mac OS X has been added. Thanks to Ruben
          Kerkhof. #1489
        * SMART plugin: A memory leak has been fixed. Thanks to Florian
          Schüller and Pierre-Yves Ritschard. #1076
        * Swap plugin: A regression that would lead to swap usage being reported
          in kilobytes (instead of bytes) has been fixed. Thanks to Marek Becka.
          #1071
        * Varnish plugin: Support for FreeBSD has been added. Thanks to Ruben
          Kerkhof. #1182
        * Varnish plugin: Support for versions 3 and 4 has been made more
          tolerant to minor changes in Varnish point releases. Thanks to Marc
          Fournier. #1302
        * virt plugin: A copy-and-paste mistake in an error message has been
          fixed. Thanks to Ruben Kerkhof. #1101
        * Write Kafka plugin: Support for Solaris has been added. Thanks to
          Shahul Hameed. #1171
        * Write Redis plugin: Dead code has been removed. Thanks to Brian Kelly.
          #1143
        * 27 patches have been applied to numerous plugins and core components,
          fixing various programming errors which were reported by scan-build,
          libasan, FBInfer, coverity-scan and clang: Thanks to Ruben Kerkhof,
          Florian Forster and Marek Becka.
        * Collectd::Unixsock: A Perl error got corrected. Thanks to Ciaran Mac
          An Iomaire. #1295

2015-05-27, Version 5.5.0
        * Build system: Ability to make out-of-tree builds has been fixed.
          Thanks to Vincent Bernat. #792
        * Build system, Disk and Users plugins: Detection and use of libstatgrab
          ≧ 0.90 has been added. Thanks to Vincent Bernat. #445, #795, #806,
          #807, #908
        * Build system, Memory, CPU, TCPConns and Processes plugins: Numerous
          fixes related to OpenBSD support have been added. Thanks to Landry
          Breuil. #777, #778, #779, #808
        * Build system: Plugins now only export "module_register()". Thanks to
          Florian Forster.
        * Build system: Various cleanups and improvements have been done. Thanks
          to Marc Fournier.
        * collectd: Numerous internal changes and improvements to the daemon and
          the plugin API have been make. Thanks to Florian Forster, Pierre-Yves
          Ritschard and Alex Petrov. #512, #727
        * collectd: Numerous spelling mistakes have been corrected in comments
          and documentation and several error messages have been improved.
          Thanks to Ruben Kerkhof, Abhinav Upadhyay, Olivier Bazoud, Pierre-Yves
          Ritschard, Tim Smith, Moshe Zada, Katelyn Perry and Marc Fournier.
        * collectd: Rules/Targets can now be appended to existing Filter Chains.
          Thanks to Marc Falzon. #444
        * collectd: Failing Filter Chains destinations will now log the list of
          available write targets. Thanks to Wilfried Goesgens. #650, #1043
        * collectd: Support for process signaling and management by upstart and
          systemd has been implemented for the Linux platform. Thanks to
          Pierre-Yves Ritschard and Marc Fournier. #798, #811, #814
        * collectd: The "CollectInternalStats" option has been added. Thanks to
          Yves Mettier. #691
        * collectd: The daemon source code and dependencies have moved to the
          "src/daemon/" directory. Thanks to Florian Forster.
        * collectd: The new "MaxReadInterval" option allows to cap the
          exponential retry interval of plugins read errors. Thanks to Alexey
          Remizov and Florian Forster. #713
        * collectd: The "-P" command-line option now has precedence over the
          "PIDFile" option. Thanks to Thomas D. #553
        * collection.cgi: Various data-source related adjustments have been
          made. Thanks to Fabiano Pires and Sebastian Harl.
        * libcollectdclient: Now propagates errors when signing / encrypting
          network packets. Thanks to Florian Forster.
        * Configuration: Support for unquoted IPv6 addresses has been added.
          Thanks to Sebastian Harl. #489
        * Documentation: Various improvements have been done. Thanks to Florian
          Forster and Marc Fournier.
        * Examples: the sample C plugin has been updated to the current plugin
          API. Thanks to Sebastian Harl.
        * Licensing: The following components have been relicensed to the MIT
          license: the Apple Sensors, Ascent, DBI, E-Mail, Entropy, GenericJMX,
          gmond, LogFile, nginx, Notify Desktop, NTPd, NUT, olsrd, Perl, Ping,
          PostgreSQL, Protocols, RouterOS, RRDCacheD, SNMP, StatsD, SysLog,
          Table, Tail, UnixSock, vmem, VServer, Wireless, Write Riemann and XMMS
          plugins, the core collectd daemon, the collectdmon, collectd-nagios
          and collectd-tg utilities, all the Targets and Matches, liboconfig,
          most of the "utils_*" files and the plugin API.
        * Tests: A test suite has been added. Thanks to Florian Forster.
        * Threshold: The hysteresis calculation has been made more reliable.
          Thanks to Jan Kundrát. #581
        * Threshold: Various fixes and improvements have been made. Thanks to
          Manuel Luis Sanmartín Rozada. #649, #644
        * AMQP plugin: The "ConnectionRetryDelay" option has been added,
          allowing to delay reconnection. Thanks to Yoga Ramalingam and Marc
          Fournier. #833
        * AMQP plugin: The "QueueDurable" and "QueueAutoDelete" options have
          been added, giving control over queue creation and deletion. Thanks to
          David Blundell and Marc Fournier. #623
        * Apache, Ascent, BIND, cURL, cURL-JSON, cURL-XML, nginx and Write HTTP
          plugins: Customizing the "User-Agent" field is now possible at
          compile-time. Thanks to Jeremy Katz. #440
        * Apache, Ascent, BIND, cURL, cURL-JSON, cURL-XML, nginx plugins: The
          connection will be reset if it hasn't completed within the configured
          "Interval". The new "Timeout" option gives control over this behavior.
          Thanks to Jan Kundrát and Marc Fournier. #982, #983, #993
        * Apache, Ascent, cURL, cURL-JSON, cURL-XML, nginx, Write HTTP plugins:
          Allow usernames and passwords to contain colons if built against
          libcurl ≧ 7.19.1. Thanks to Marc Fournier. #695, #947
        * Apache plugin: The "SSLCiphers" option gives control over the
          encryption algorithms to use with TLS connections. Thanks to Toni
          Moreno. #946
        * Barometer plugin: This new plugin reads sensor data from various
          Freescale and Bosch digital barometers. Thanks to Tomas Menzl. #69,
          #693
        * Battery plugin: Reporting values as percentages and reporting degraded
          batteries has been added. Thanks to Florian Forster.
        * Battery plugin: Support for reading values from sysfs on Linux has
          been added. Thanks to Andy Parkins, Nicholas Humfrey, Peter Wu and
          Florian Forster. #725, #810, #998
        * Battery plugin: The value for current is no longer supplied unless the
          battery provides this information. Thanks to Florian Forster.
        * BIND plugin: Bind's XML v3 API is now supported; Thanks to Victor
          Berger, Bruno Prémont and Michal Humpula. #742, #847
        * Ceph plugin: This new plugin collects statistics from the Ceph
          distributed storage system. Thanks to Dan Ryder, Dennis Zou, Colin
          McCabe, Sage Weil. #522, #598
        * ConnTrack plugin: Support for reporting values as percentages as well
          as legacy conntrack files in "/proc" has been added. Thanks to
          Pierre-Yves Ritschard. #497, #680
        * CPU plugin: The plugin is now able to report values as percentages and
          aggregate values per-state and per-CPU. Thanks to Pierre-Yves
          Ritschard, Florian Forster, Fabien Wernli, Nicholas Humfrey and
          Wilfried Goesgens. #499, #516, #639 #734, #812, #802
        * cURL-JSON plugin: Extracting values from complex JSON structures has
          been enhanced. Thanks to Jim Radford. #408, #411
        * cURL-JSON plugin: Intervals can now be configured on a per-URL basis.
          Thanks to Stan Sawa. #685
        * cURL-JSON, cURL-XML, Write HTTP plugins: These plugins now also follow
          HTTP redirects. Thanks to Marc Fournier.
        * cURL, cURL-JSON, cURL-XML plugins: HTTP Digest authentication has been
          implemented. Thanks to Frank Cornelis. #482
        * DBI, Oracle, PostgreSQL plugins: A "MetadataFrom" parameter has been
          added which allows to set metadata from database columns. Thanks to
          Mark Wong. #317, #321
        * DBI plugin: Querying several databases in parallel is now possible.
          Thanks to Vincent Bernat. #453
        * Disk plugin: On the Linux platform, disk names can now get looked up
          in udev with the "UdevNameAttr" option. Thanks to Patrick Mooney. #537
        * Disk plugin: This plugin now collects several additional I/O-related
          metrics on the Linux platform. Thanks to Florian Forster and Michael
          Schenck. #705, #759
        * DRBD plugin: This new plugin reads Linux's Distributed Replicated
          Block Device (DRBD) statistics. Thanks to Tim Laszlo. #566, #700
        * Exec, UnixSock plugins: The "PUTNOTIF" command now allows to set
          metadata on notifications. Thanks to John-John Tedro. #416
        * fhcount plugin: This new plugin reports the number of used file
          handles. Thanks to Jiri Tyr. #1009
        * GenericJMX plugin: A Class Loader for "JMXConnectorFactory" has been
          added, allowing the plugin to work with JBOSS > 7. Thanks to Alexandre
          Moutot. #452
        * IPC plugin: This new plugin collects information related to shared
          memory. Thanks to Andrés J. Díaz. #925
        * Java plugin: Now uses the hostname defined in the configuration file.
          Thanks to Pierre-Yves Ritschard. #530, #681
        * Load plugin: The plugin is now able to report values as percentages.
          Thanks to Vedran Bartonicek and Pierre-Yves Ritschard. #344, #498
        * Log Logstash plugin: This new plugin writes collectd logs and events
          as Logstash JSON formatted events. Thanks to Pierre-Yves Ritschard.
          #360
        * LVM plugin: The plugin collects thin pool data volumes size, and no
          longer reports virtual volumes. Thanks to Benjamin Gilbert. #603
        * memcached plugin: "listen_disabled_num" are now also reported. Thanks
          to Matt Cottingham. #622
        * Memory plugin: Slab memory reporting on the Linux platform has been
          added. Thanks to Manuel CISSÉ and Marc Fournier. #560, #697
        * Memory plugin: The plugin is now able to report values as percentages.
          Thanks to Jeremy Katz, Florian Forster and Manuel CISSÉ. #501, #511,
          #559
        * Modbus plugin: Selecting between holding and input registers is now
          possible. Thanks to Jan Vitek. #338
        * Modbus plugin: Support for accessing devices through an RS-485 serial
          port has been added. Thanks to Eric Sandeen.
        * Multimeter plugin: This plugin isn't built by default on the AIX
          platform anymore. Thanks to Manuel Luis Sanmartin Rozada. #549, #684
        * MySQL and PostgreSQL plugins: Passing "127.0.0.1" as a host will now
          result in the global Hostname being used in metric names. Thanks to
          Jeremy Katz. #441
        * MySQL plugin: InnoDB, Select and Sort statistics collection has been
          added. Thanks to Wilson Felipe, Marek Becka and Pierre-Yves Ritschard.
          #248, #621, #699, #824
        * MySQL plugin: The "Alias" and "ConnectTimeout" options have been
          added. Thanks to William Tisäter.
        * Netlink plugin: Support for 64bit netlink counters has been added.
          Thanks to Marek Becka. #435
        * Network plugin: The "ReconnectInterval" configuration option has been
          added. Thanks to John Ferlito. #732
        * NFS plugin: Support for NFSv4.0 has been implemented. Thanks to Marek
          Becka. #550
        * OneWire plugin: Support for more temperature-providing sensor families
          has been added. Thanks to Tomasz Torcz. #672
        * OneWire plugin: Support for full OWFS path and more device families
          has been implemented. Thanks to Tomas Menzl. #68
        * OpenLDAP plugin: This new plugin reads monitoring information from
          OpenLDAP's "cn=Monitor" subtree. Thanks to Kimo Rosenbaum, Marc
          Fournier and Nicholas Humfrey. #719
        * OpenVPN plugin: Support for OpenVPN 2.3.0 has been implemented. Thanks
          to Ed Okerson. #252
        * OpenVZ plugin: Various improvements have been made, making the plugin
          report values like the other collectd plugins do. Thanks to Chris
          Lundquist. #264
        * Perl plugin: A new "listval_filter" method has been added, various
          internal cleanups and improvements have been made and a test suite has
          been added. Thanks to Matthias Bethke. #728
        * PostgreSQL plugin: The new "ExpireDelay" option allows skipping older
          values pending write when the database slows down. Thanks to Stephen
          O'Dor. #593
        * PowerDNS plugin: The plugin was updated for stats from pdns 3.4.3.
          Thanks to Ruben Kerkhof. #965
        * Processes plugin: A memory-usage related optimization for low-profile
          systems has been added. Thanks to Florian Forster. #652
        * Python plugin: Support for Python3 has been improved, "ModulePath" is
          now prepended to "sys.path", and the "get_dataset()" function has been
          added to the Python API. Thanks to Sven Trenkel and Patrick Browne.
          #890, #751, #771
        * Redis and Write_Redis plugins: The support library has been switched
          from credis to hiredis. Thanks to Andrés J. Díaz, Victor Seva, Marc
          Fournier, Johan Bergström, Michael Spiegle and brianpkelly. #296,
          #464, #475, #799, #1030
        * Redis plugin: Custom commands can now be used to fetch values stored
          in Redis. Thanks to Pierre-Yves Ritschard. #816
        * Redis plugin: Support for passwords up to 512 characters long has been
          added. Thanks to Jeremy Katz. #532
        * Sensors plugin: Support for lm_sensors' power sensors has been added.
          Thanks to Jan Kundrát. #571
        * SMART plugin: This new plugin collects SMART statistics from disk
          drives. Thanks to Vincent Bernat. #797
        * SNMP plugin: A blacklist/whitelist feature can now be used to filter
          which OIDs to collect. Thanks to Christophe Courtaut. #414
        * SNMP plugin: SNMPv3 authentication and encryption support has been
          implemented. Thanks to Michael Pilat. #362
        * SNMP plugin: Two error messages have been disambiguated. Thanks to
          Sergey. #939, #952
        * Swap plugin: The plugin is now able to report values as percentages.
          Thanks to Jeremy Katz and Florian Forster. #500, #510
        * Swap plugin: The plugin no longer fails on Linux systems where
          "SwapCached" isn't exposed by the kernel. Thanks to Florian Forster.
          #733
        * Tail plugin: "GaugeInc" and "GaugeAdd" options have been implemented.
          Thanks to Andre Ferraz. #673
        * Tail plugin: Intervals can now be configured on a per-File basis.
          Thanks to Tom Leaman. #446
        * TCPConns plugin: The "AllPortsSummary" option, allowing to summarize
          all connections, has been added. Thanks to Marek Becka. #488
        * TCPConns plugin: Three metrics were renamed on the AIX platform, for
          the sake of consistency. Thanks to Manuel Luis Sanmartín Rozada. #546
        * Turbostat plugin: This new plugin reads CPU frequency and C-state
          residency on modern Intel turbo-capable processors. Thanks to Vincent
          Brillault, Jean Delvare and Nicolas Iooss. #651
        * UnixSock plugin: The "GETTHRESHOLD" command has been re-added. Thanks
          to Manuel Luis Sanmartín Rozada. #674
        * Varnish plugin: Varnish 4 support has been added, as well as as
          monitoring metrics only available in Varnish 4. Thanks to Marc
          Fournier. #618, #783
        * virt plugin: Guests memory usage is now also collected. Thanks to
          Tiago Carvalho, jazzmes and Zollner Robert.
        * virt plugin: It is now possible to chose between using guests' name or
          UUID as plugin_instance. Thanks to Remi Ferrand. #385
        * virt plugin: The libvirt plugin has been renamed to virt. Thanks to
          Florian Forster.
        * Write Graphite plugin: When the connection to graphite fails,
          reconnection attempts are now limited to once per second. Thanks to
          Florian Forster. #625
        * Write HTTP plugin: Multi-instance support of this plugin has been
          improved. The "<URL "url">" block has been deprecated in favor of
          "<Node "identifier">". Thanks to Marc Fournier. #902
        * Write HTTP plugin: Several TLS-related configuration options have been
          added. Thanks to Ingmar Runge. #666
        * Write HTTP plugin: The "LowSpeedLimit" and "Timeout" options allow to
          reset slow/stalled network connections. Thanks to loginator17 and Marc
          Fournier. #752, #985
        * Write HTTP plugin: The size of the payload posted to the HTTP server
          can now be controlled with the "BufferSize" option. Thanks to Florian
          Forster. #722
        * Write Kafka plugin: This new plugin sends data to Apache Kafka, a
          distributed messaging queue. Thanks to Pierre-Yves Ritschard,
          ciomaire, Vincent Bernat, Marc Fournier. #670, #694, #794, #853, #014
        * Write Log plugin: This new plugin dispatches collected values to the
          configured log destination(s). Thanks to Pierre-Yves Ritschard. #886
        * Write Riemann plugin: Extra meta strings are now added as attributes
          in notifications. Thanks to John-John Tedro. #417
        * Write Riemann plugin: Notification message are now sent to the Riemann
          server via the description field. Thanks to Adrian Miron. #575
        * Write Riemann plugin: Support for custom attributes has been added.
          Thanks to Pierre-Yves Ritschard. #459
        * Write Riemann plugin: Support had been implemented for sending events
          to Riemann in batches (when using TCP), and is enabled by default.
          Thanks to Pierre-Yves Ritschard. #800
        * Write Riemann plugin: The "EventServicePrefix" option has been added,
          which adds a prefix to event service names. Thanks to Moshe Zada. #706
        * Write Riemann plugin: Threshold checks can now be passed down to the
          Riemann server. Thanks to Pierre-Yves Ritschard. #518
        * Write Sensu plugin: This new plugin submits values to Sensu, a stream
          processing and monitoring system. Thanks to Fabrice A. Marie and Marc
          Fournier. #912, #1001, #1016
        * Write TSDB plugin: This new plugin sends data to OpenTSDB, a scalable
          time series database. Thanks to Kevin Bowling, Florian Forster, Dallin
          Young, Michael Schenck and Pierre-Yves Ritschard. #703, #772, #945
        * ZFS ARC plugin: Support for ZFS-on-Linux has been added. Thanks to
          Marc Fournier and Wilfried Goesgens. #552
        * Zookeeper plugin: This new plugin reads data from the Apache Zookeeper
          "MNTR" command. Thanks to Jeremy Katz. #826

2016-07-26, Version 5.4.3
        * Build system: A deprecation warning has been removed. Thanks to
          Florian Forster.
        * Build system: An ordering issue when build the AMQP plugin was
          corrected. Thanks to Shahul Hameed.
        * Build system: Building the gmond plugin against recent libganglia
          versions has been added. Thanks to Marc Fournier. #1129
        * Build system: "collectd-tg" now builds on AIX. Thanks to Manuel Luis
          Sanmartín Rozada. #542
        * Build system: "version-gen.sh" portablility was improved. Thanks to
          Marc Fournier and Ruben Kerkhof.
        * Build system: Compiling utils_dns.c on Solaris has beed fixed. Thanks
          to Yves Mettier, Dagobert Michelsen and Florian Forster. #348
        * Build system: Default JDK detection got improved. Thanks to Ruben
          Kerkhof and Marc Fournier.
        * Build system: Detection and handling of librrd 1.6 and later has been
          fixed. Thanks to Ruben Kerkhof.
        * Build system: notify_email build options got corrected to make it
          build on non-GNU libc systems. Thanks to Marc Fournier.
        * Build system: Protobuf building and logging has been improved. Thanks
          to Ruben Kerkhof.
        * Build system: The "make distcheck" target was fixed to properly handle
          java build artifacts. Thanks to Florian Forster.
        * Build system: The configure script got fixed to work properly when
          called with "CC="gcc -Wall -Werror"" . Thanks to Marc Fournier.
        * Build system: The configure script will now fail if pkg-config isn't
          available. Thanks to Ruben Kerkhof.
        * Build system: The users plugin now builds properly on Solaris when
          libstatgrab is available. Thanks to Dagobert Michelsen. #1061
        * Build system: Various fixes have been done to improve library
          detection on FreeBSD. Thanks to Ruben Kerkhof.
        * collectd2html: Several perl errors have been corrected. Thanks to Ruud
          van Melick. #1103
        * collectd: A global gauge format-string is now used to avoid loss of
          precision. Thanks to Florian Forster. #1039
        * collectd: A race condition at plugin initialization time was fixed.
          Thanks to Jan Andres. #1316
        * collectd: Autoloading now properly sets plugin context, allowing
          plugins to determine the interval. Thanks to Florian Forster. #1069
        * collectd: Empty "Plugin" blocks are now supported by the configuration
          file parser. Thanks to Manuel Luis Sanmartín Rozada. #1035
        * collectd: The address of the Free Software Foundation has been fixed
          in GPL license headers. Thanks to Ruben Kerkhof.
        * collectd: Writing to a closed TCP socket is now properly handled.
          Thanks to Tamás Földesi. #1104
        * Documentation: iptables plugin: IPv6 configuration option has been
          added to the collectd.conf(5) manpage. Thanks to 'Marc Fournier''.
          #1496
        * AMQP plugin: The plugin was fixed to build against librabbitmq 0.6.0.
          Thanks to Remi Collet. #1008
        * Apache plugin: A warning about a possible misconfiguration has been
          added. Thanks to Marc Fournier.
        * Apache plugin: The plugin was extended to parse the whole response,
          required to support Apache versions greater than 2.4.17. Thanks to
          Marc Fournier and Florian Forster. #1170, #1343
        * APC UPS plugin: Log messages are now prefixed with the plugin name.
          Thanks to Sergey. #1329
        * Bind plugin: The type_instance now gets properly sanitized. Thanks to
          Thomas Kho. #992
        * CPU plugin: Error messages on MacOSX have been improved. Thanks to
          Florian Forster. #22
        * cURL plugin: A typo in an error message got corrected. Thanks to Marc
          Fournier.
        * cURL, cURL-JSON and cURL-XML plugins: A memory leak when allocating
          more memory fails has been fixed. Thanks to Brandon Arp.
        * DF plugin: An bug preventing filesystems which don't report inodes
          such as btrfs has been corrected. Thanks to Marek Becka. #1096
        * DF plugin: Duplicate entries are no longer reported twice. Thanks to
          Stefan Brüns and Florian Forster. #1402
        * DF plugin: Legacy code for skipping "rootfs" mount points has been
          removed. Thanks to Marc Fournier. #1402
        * DF plugin: Legacy references to the "ReportReserved" option have been
          removed. Thanks to Marc Fournier.
        * DF plugin: Reading the mtab now uses a reentrant function when
          possible. Thanks to Ruben Kerkhof. #1163
        * Ethstat plugin: Code to strip leading whitespace from device names.
          This works around an issue in the VMXNet3 driver. Thanks to Thomas
          Guthmann. #1059
        * Exec plugin: A file descriptor leak when the plugin is configured to
          run as a non-existing user was corrected. Thanks to Gautam BT and Marc
          Fournier. #762
        * Exec plugin: A problem in the error handling of an fdopen() failure
          has been fixed. Thanks to @ciomaire.
        * Interface plugin: Documentation about regular expressions in the
          ignore list has been added. Thanks to Jakub Jankowski.
        * IRQ plugin: The "FIQ" line is now skipped as it doesn't contain any
          counter. Thanks to Ruben Kerkhof. #971
        * Modbus plugin: The debug output has been disabled by default. It is
          now only enabled when building with "--enable-debug". Thanks to Eric
          Sandeen and Marc Fournier.
        * MongoDB plugin: A memory leak has been fixed and some adaptations to
          the current API of the mongo-c-driver have been made. Thanks to
          Florian Forster. #956
        * Network plugin: A check for the initialization of secure memory has
          been added. Previously, failure to initialize this memory was ignored.
          Thanks to @yujokang. #1665
        * Network plugin: A heap overflow has been fixed in the server code.
          This issue can be triggered remotely and is potentially exploitable.
          Thanks to Emilien Gaspar. CVE-2016-6254
        * Network plugin: The TimeToLive option handling was made more robust.
          Thanks to Tim Laszlo. #654
        * NTPd plugin: Documentation about the required "mode 7" has been added.
          Thanks to Jakub Jankowski.
        * NTPd plugin: Reporting of "time_offset-loop" was corrected to match
          the values from ntpq/ntpdc. Thanks to Pierre Fersing and Florian
          Forster. #1300
        * OpenVPN plugin: The plugin was fixe to avoid signaling an error when
          no clients were connected. Thanks to Florian Forster. #731
        * Perl plugin: Init callbacks have been changed to run essentially
          single-threaded to avoid race conditions by init functions which
          create additional threads. Thanks to Pavel Rochnyack. #1706
        * PF plugin and DNS plugin: These plugins have been fixed to build
          properly on OpenBSD again. Thanks to Ruben Kerkhof.
        * Processes plugin: A compilation error on systems without "regex.h" has
          been fixed. Thanks to Corey Kosak.
        * Processes plugin: A memory leak on Solaris has been fixed. Thanks to
          Jim Quinn.
        * Processes plugin and Swap plugin: These plugins have been corrected to
          also work inside FreeBSD jails. Thanks to biancalana. #1019
        * Processes plugin: A warning about too long process names has been
          added. Thanks to Marc Fournier. #1284
        * Processes plugin: Process counting on the FreeBSD and OpenBSD
          platforms has been fixed. Thanks to Herve COMMOWICK. #1298
        * Processes plugin: The plugin was fixed to work properly on Solaris.
          Thanks to Jan Andres. #919
        * Python plugin: A double-free bug got fixed. Thanks to Sven Trenkel.
          #1285
        * RRDtool plugin: A race condition leading to corrupt RRD file creation
          has been fixed. Thanks to Manuel Luis Sanmartín Rozada. #1031
        * SNMP plugin: The "Gauge32" signedness was corrected to match RFC1902.
          Thanks to Nathan Ward. #1325
        * StatsD plugin: A deadlock on plugin shutdown has been fixed. Thanks to
          Pavel Rochnyack #1703
        * StatsD plugin: A memory leak was corrected. Thanks to Florian Forster.
          #997
        * StatsD plugin: A symbol lookup error was fixed by properly linking the
          plugin against libm. Thanks to Florian Forster.
        * StatsD plugin: "utils_latency": Support for including values above
          1000 in percentile calculation has been added. Thanks to Yoga
          Ramalingam. #401
        * StatsD plugin: "utils_latency": Two division by zero error conditions
          have been corrected. Thanks to Wilfried Goesgens. #655
        * StatsD plugin: Counters absolute counts are now also reported. Thanks
          to Pierre-Yves Ritschard. #1311
        * StatsD plugin: The plugin now emits NaN values when no timer event is
          recorded. Thanks to Florian Forster. #1038, #1039
        * StatsD plugin: The plugin was corrected to avoid crashing when
          negative timer values are submitted. Thanks to Florian Forster. #1131
        * Tail CSV plugin: The plugin was fixed to work properly with multiple
          "Collect" options and a bug got fixed when no "TimeFrom" is specified.
          Thanks to Manuel Luis Sanmartín Rozada and Florian Forster. #1032
        * TCPConns plugin: A memory leak was fixed. Thanks to Florian Forster.
          #1074
        * TCPConns plugin: An bug causing collectd to enter an inifinite loop on
          OpenBSD was fixed. Thanks to Landry Breuil. #1094
        * Threshold plugin: Threshold configuration blocks can now be defined in
          different files. Thanks to Michael Salmon. #551
        * vmem plugin: Support for pgsteal in recent Linux kernels has been
          added. Thanks to Jakub Jankowski. #1307
        * vmem plugin: The DSType for nr_dirtied and nr_written was corrected to
          report a derive. Thanks to Marek Becka. #1072
        * Write Graphite plugin: Error handling when submitting metrics to the
          server is now more robust. Thanks to Sam Pointer. #1364
        * Write HTTP plugin: Freeing of memory holding HTTP headers during
          shutdown has been fixed. Thanks to Tolga Ceylan.
        * Write Redis plugin: Multi-Valued key was made easier to parse by
          adding a "|" character as a delimiter. Thanks to brianpkelly and
          Florian Forster. #1070
        * Write Redis plugin: The timestamp format was corrected. Thanks to
          Florian Forster.
        * ZFS ARC plugin: The plugin was will not emit warning about missing
          "l2_size" stats anymore. Thanks to Jan Andres. #919
        * 152 patches have been applied to numerous plugins and core components,
          fixing various programming errors which were reported by scan-build,
          libasan, FBInfer, coverity-scan, clang and gcc-6: Thanks to Ruben
          Kerkhof, Florian Forster, Marc Fournier, Corey Kosak, Laurent,
          Claudius Zingerli and Fabien Wernli.

2015-02-26, Version 5.4.2
        * Build system: Numerous fixes. Thanks to Bjørn Nordbø, Jim Radford,
          KOMEDA Shinji, Lauri Tirkkonen, Manuel Luis Sanmartin Rozada, Marc
          Fournier, Rainer Müller, Yoga Ramalingam and Yves Mettier. #326,
          #373, #653, #828
        * collectd: A use-after-free has been fixed in the "parse_value()"
          function. Thanks to Matthias Urlichs.
        * collectd: Fix carriage return sign in types_list Thanks to Marc
          Fournier and @NsLib.
        * collectd: Fix programming error in src/configfile.c. Thanks to
          Wilfried Goesgens.
        * collectd: An off-by-one error has been fixed in the
          "strstripnewline()" function. Patch by Florian Forster.
        * collectd: Use the complain mechanism to report filter chain write
          failures. Thanks to Sebastian Harl.
        * collectd: Spelling and grammar of error messages have been fixed.
          Thanks to Katelyn Perry and Tim Laszlo.
        * collectdctl: Fixed buffering issues which caused trouble on AIX and
          Solaris. Thanks to Yoga Ramalingam.
        * Documentation: Details and example about multi-instance filterchain
          targets have been added. Thanks to Marc Fournier.
        * Documentation: The "CollectStatistics" option of the rrdcached has
          been documented. Thanks to Micha Krause. #907
        * Documentation: The write_redis has been documented. Thanks to Marc
          Fournier.
        * Documentation: The "GraphiteSeparateInstances" and
          "GraphiteAlwaysAppendDS" options of the amqp have been documented.
          Thanks to Marc Fournier.
        * Documentation: Documentation of the "AutoLoadPlugin" option has been
          improved. Thanks to Florian Forster. #715
        * aggregation: "utils_vl_lookup": A race when creating user objects
          has been fixed. Thanks to Sebastian Harl. #535
        * cpu: Temperature code for Mac&nbsp;OS&nbsp;X has been removed.
          Thanks to Florian Forster and Marc Fournier. #22
        * cURL, cURL-JSON, cURL-XML and Write HTTP plugins: Call
          "curl_global_init()" in the plugins' "init()" callback. Thanks to
          Jeremy Katz.
        * cURL and memcachec plugins: Fix calculation of gauge, average,
          minimum and maximum. Previously, they were calculated from the start
          of the daemon, which is not the documented behavior. Thanks to
          Florian Forster. #663
        * curl-json: A bug, which triggered when two URLs with a long common
          prefix were configured, was fixed. Thanks to Marc Fournier. #582
        * dbi: Compatibility with new versions of libdbi has been restored.
          Thanks to Florian Forster. #950
        * Exec, UnixSock plugins: Fix parsing of the "time" option of the
          "PUTNOTIF" command. Thanks to Adrian Miron. #477
        * ipmi: A conflict with the java over the "SIGUSR2" signal has been
          fixed. Thanks to Vincent Bernat. #114
        * java: Conversion from Java's time representation to collectd's
          representation has been fixed. Thanks to Manuel Luis Sanmartín
          Rozada.
        * java: Make sure "cjni_thread_detach()" is called on all paths.
          Thanks to Florian Forster.
        * LogFile and SysLog plugins: Avoid total silence in case of a
          misconfiguration. Thanks to Marc Fournier and Wilfried Goesgens.
        * network: Support for recent versions of gcrypt has been added.
          Thanks to Vincent Bernat. #632
        * network: Robustness of the client connecting behavior has been
          improved. Thanks to Florian Forster. #627
        * python: Don't create empty "meta_data_t" objects. Thanks to Florian
          Forster. #716
        * python: Fix Py list length check in "cpy_build_meta()". Thanks to
          Yoga Ramalingam.
        * python: The "interval" member was fixed to export seconds as a
          double. Thanks to Justin Burnham.
        * RRDtool and RRDCacheD plugins: A memory leak when creating RRD files
          has been fixed. Thanks to Yves Mettier. #661
        * snmp: Fix a memory leak. Thanks to Marc Fournier and Pierre-Yves
          Ritschard. #610, #804
        * statsd: Support for samplerates in timer metrics was added. Thanks
          to John Leach. #461
        * swap: Fix behavior under OpenVZ by making "cached" optional. Thanks
          to Florian Forster. #733
        * threshold: Population of the "time" field in notifications has been
          added. Thanks to Manuel Luis Sanmartín Rozada.
        * libvirt: Only gather stats for running domains. Thanks to Ruben
          Kerkhof.
        * lvm: An issue with Volume Groups (VGs) without Logical Volumes (LVs)
          has been fixed. Thanks to Jan Kundrát.
        * write_graphite: Escape characters not supported by Graphite. Thanks
          to Pierre-Yves Ritschard and Marc Fournier.
        * write_http: Make callback names context-dependent. Thanks to Marc
          Fournier. #821
        * write_redis: A formatting bug, which resulted in totally unusable
          numbers being transmitted to Redis, was fixed. Thanks to Marc
          Fournier.
        * write_riemann: Receive acknowledge message when using TCP. Thanks to
          John-John Tedro.

2014-01-26, Version 5.4.1
        * amqp plugin: Add support for RabbitMQ 0.4.x to avoid compiler
          warnings. Thanks to Sebastian Harl for implementing this.
        * apache / network plugins: Improved initialization order hopefully
          resolved gcrypt initialization problems.
        * aquaero plugin: The type used to submit fan utilization was fixed.
          Thanks to Alex Deymo for the patch.
        * cgroups plugin: A small memory leak was fixed. Checking the existence
          of a mount option without a value was fixed. More permissive parsing
          of the cpuacct.stats file fixes support for some versions of Linux.
          Thanks to Marc Fournier for bug reports and patches.
        * curl plugin: Fix <Match> blocks without an instance. Thanks to
          Alexander Golovko for reporting and Sebastian Harl for fixing this.
        * curl_json plugin: Potentially invalid memory access has been
          sanitized. Thanks to Jim Radford for his patch.
        * interface plugin: Fix behavior under FreeBSD 10: Reporting of
          per-address statistics caused duplicate updates to the same metric.
          Thanks to demon / @trtrmitya for the patch.
        * write_graphite plugin: Use TCP to connect to Graphite by default. The
          default changed from TCP to UDP between 5.3.1 and 5.4.0, which is a
          regression. Thanks to Marc Fournier for fixing this. Reconnect
          behavior was improved. Thanks to Michael Hart for his patch.
        * zfs_arc plugin: Collect "allocated" and "stolen" on FreeBSD only.

2013-08-18, Version 5.4.0
        * collectd: The "LoadPlugin" config option no longer attempts to load
          plugins twice. If more than one "LoadPlugin" statement or block is
          encountered, only the first will have any effect.
        * collectd: The "AutoLoadPlugin" option allows to automatically load
          plugins for which a configuration is found.
        * collectd: The "WriteQueueLimitHigh" and "WriteQueueLimitLow" options
          allow collectd to drop values when under stress, to avoid running out
          of memory. Thanks to Yves Mettier for his patch.
        * amqp plugin: The "GraphiteSeparateInstances" and
          "GraphiteAlwaysAppendDS" options have been added. Thanks to Laurent
          for the patch.
        * aquaero plugin: This new plugin reads various metrics, e.g. fan
          speeds and temperatures, from Aquaero 5, a fan and water cooling
          control panel. Thanks to Alex Deymo for his patch.
        * curl plugin: The "MeasureResponseCode" option has been added. Thanks
          to Jan Matějka for his patch.
        * curl_json plugin: Support for UNIX domain sockets and array wildcards
          has been added. Thanks to Jim Radford for his patch.
        * curl_xml plugin: Support for long URLs has been improved.
        * cgroups plugin: This new plugin collects CPU accounting information
          for processes in a cgroup. Thanks to Michael Stapelberg for his patch.
        * df plugin: The "ValuesAbsolute" and "ValuesPercentage" options have
          been added. Thanks to Vedran Bartonicek for the patch.
        * exec plugin: Do UID / GID lookups before forking. This should prevent
          a race condition in the NSS library. Thanks to Ceri Storey for the
          patch.
        * lvm plugin: This new plugin collects size information from Linux'
          Logical Volume Manager (LVM). Thanks to Chad Malfait for his work.
        * memcached plugin: Support for increment and decrement counts has been
          added. Thanks to Blake Matheny for the patch.
        * mic plugin: This new plugin collects CPU and memory usage, power
          consumption and temperatures of Intel's Many-Integrated-Core (MIC)
          architecture, such as Xeon Phi cards. Thanks to Evan Felix for his
          work.
        * netlink plugin: This plugin has been converted to use the supported
          "libmnl" library. Thanks to Andreas Henriksson for his patch.
        * nginx plugin: Collection of accepted and handled connections has been
          added. Thanks to Patrick Shan for his patch.
        * sigrok plugin: This new plugin collects metrics from sigrok, a signal
          processing framework reading various hardware devices, from light
          meters to spectrum analyzers. Thanks to Bert Vermeulen for his patch.
        * statsd plugin: This new plugin listens to a UDP socket and reads
          metrics in the StatsD format.
        * varnish plugin: Many additional metrics have been added. Thanks to
          Nick Stenning for his patch.
        * write_graphite plugin: Support for "UDP" has been added. Thanks to
          Javier Maestro for his patch.
        * write_riemann plugin: The "TTLFactor" option has been added.
        * zfs_arc plugin: Support for FreeBSD has been added. Thanks to Xin Li
          for his patch.

2015-02-26, Version 5.3.2
        * Build system: Numerous fixes. Thanks to Bjørn Nordbø, Jim Radford,
          KOMEDA Shinji, Lauri Tirkkonen, Manuel Luis Sanmartin Rozada, Marc
          Fournier, Rainer Müller, Yoga Ramalingam and Yves Mettier. #326,
          #373, #653, #828
        * collectd: A use-after-free has been fixed in the "parse_value()"
          function. Thanks to Matthias Urlichs.
        * collectd: Fix carriage return sign in types_list Thanks to Marc
          Fournier and @NsLib.
        * collectd: Fix programming error in src/configfile.c Thanks to
          Wilfried Goesgens.
        * collectd: An off-by-one error has been fixed in the
          "strstripnewline()" function. Patch by Florian Forster.
        * collectd: Use the complain mechanism to report filter chain write
          failures. Thanks to Sebastian Harl.
        * collectd: Spelling and grammar of error messages have been fixed.
          Thanks to Katelyn Perry and Tim Laszlo.
        * collectdctl: Fixed buffering issues which caused trouble on AIX and
          Solaris. Thanks to Yoga Ramalingam.
        * Documentation: Details and example about multi-instance filterchain
          targets have been added. Thanks to Marc Fournier.
        * Documentation: The "CollectStatistics" option of the rrdcached has
          been documented. Thanks to Micha Krause. #907
        * Documentation: The write_redis has been documented. Thanks to Marc
          Fournier.
        * Documentation: The synopsis of the threshold has been fixed. Thanks
          to Fabien Wernli.
        * Documentation: The "GraphiteSeparateInstances" and
          "GraphiteAlwaysAppendDS" options of the amqp have been documented.
          Thanks to Marc Fournier.
        * aggregation: "utils_vl_lookup": A race when creating user objects
          has been fixed. Thanks to Sebastian Harl. #535
        * cpu: Temperature code for Mac&nbsp;OS&nbsp;X has been removed.
          Thanks to Florian Forster and Marc Fournier. #22
        * csv: A regression which would lead to the "DataDir" option to be
          ignored has been fixed. Thanks to Manuel Luis Sanmartin Rozada.
        * curl, curl-json, curl-xml and write_http plugins: Call
          "curl_global_init()" in the plugins' "init()" callback. Thanks to
          Jeremy Katz.
        * curl and memcachec plugins: Fix calculation of gauge, average,
          minimum and maximum. Previously, they were calculated from the start
          of the daemon, which is not the documented behavior. Thanks to
          Florian Forster. #663
        * dbi plugin: Compatibility with new versions of libdbi has been
          restored. Thanks to Florian Forster. #950
        * exec, unixsock plugins: Fix parsing of the "time" option of the
          "PUTNOTIF" command. Thanks to Adrian Miron. #477
        * java: Conversion from Java's time representation to collectd's
          representation has been fixed. Thanks to Manuel Luis Sanmartín
          Rozada.
        * ipmi: A conflict with the java over the "SIGUSR2" signal has been
          fixed. Thanks to Vincent Bernat. #114
        * java: Make sure "cjni_thread_detach()" is called on all paths.
          Thanks to Florian Forster.
        * logfile and syslog plugins: Avoid total silence in case of a
          misconfiguration. Thanks to Marc Fournier and Wilfried Goesgens.
        * memcached: Connecting to a UNIX socket has been fixed. Thanks to Jim
          Radford.
        * network: Support for recent versions of gcrypt has been added.
          Thanks to Vincent Bernat. #632
        * network: Robustness of the client connecting behavior has been
          improved. Thanks to Florian Forster. #627
        * python: Don't create empty "meta_data_t" objects. Thanks to Florian
          Forster. #716
        * python: Fix Py list length check in "cpy_build_meta()". Thanks to
          Yoga Ramalingam.
        * python: The "interval" member was fixed to export seconds as a
          double. Thanks to Justin Burnham.
        * replace and set targets: Fix error message. Thanks to Marc Fournier.
          #448
        * rrdtool and rrdcached plugins: Honor the "DataDir" config option;
          this fixes a regression. Thanks to Florian Forster. #380
        * rrdtool and rrdcached plugins: A memory leak when creating RRD files
          has been fixed. Thanks to Yves Mettier. #661
        * snmp: Fix a memory leak. Thanks to Marc Fournier and Pierre-Yves
          Ritschard. #610, #804
        * swap: Fix behavior under OpenVZ by making "cached" optional. Thanks
          to Florian Forster. #733
        * threshold: Population of the "time" field in notifications has been
          added. Thanks to Manuel Luis Sanmartín Rozada.
        * libvirt: Only gather stats for running domains. Thanks to Ruben
          Kerkhof.
        * write_graphite: Escape characters not supported by Graphite. Thanks
          to Pierre-Yves Ritschard and Marc Fournier.
        * write_http: Make callback names context-dependent. Thanks to Marc
          Fournier. #821
        * write_riemann: Receive acknowledge message when using TCP. Thanks to
          John-John Tedro.

2013-07-13, Version 5.3.1
        * Documentation: Various fixes.
        * Configuration: Fix error handling: Errors in included files were
          ignored, causing configuration mistakes to go unnoticed.
        * dns plugin: Don't abort when PCAP returns an error.
        * modbus plugin: The reconnection strategy was improved, fixing a
          segfault in the libmodbud library. Thanks to Stefan Nickl and
          Fabien Wernli for their patches.
        * mysql plugin: The notification about a newly running MySQL slave
          thread has been fixed. Thanks to Joaquín Cuenca Abela for the patch.
        * snmp plugin: A build issue has been fixed (C99 mixed declaration).
          The end-of-tree check has been improved by Pierre-Yves Ritschard.
        * threshold plugin: Handling of the "Interesting" configuration option
          has been fixed. Thanks to Björn for the patch.
        * write_riemann plugin: A memory leak has been fixed. Thanks to Dave
          Cottlehuber for reporting it.

2013-04-09, Version 5.3.0
        * collectd: The "Include" statements can now be limited to include
          only matching files in a directory. Thanks to Sebastian Harl for his
          patch.
        * collectd: Dispatches / writes are now handled by a thread pool. This
          improves reliability and throughput for instances configured to act
          as a "server". Thanks to Sebastian Harl and Dan Fandrich for
          reviewing this change and fixing bugs.
        * aggregation plugin: Selection of value lists is now possible using
          regular expressions. Parts of the identifier of the resulting metric
          can now be set via the configuration file.
        * apcups plugin: The "ReportSeconds" option has been implemented.
        * curl* plugins: Support for POST requests and custom request headers
          has been added. Thanks to Dan Fandrich for his patch.
        * curl_xml plugin: Support for XML namespaces has been added. Thanks
          to Dan Fandrich for his patch.
        * dbi plugin: Support for numeric options has been added. The
          "Host" option has been added. Thanks to Daniel Hilst for his patch.
        * disk plugin: Support for systems with >256 has been fixed. Thanks to
          Greg Mason for his patch.
        * libvirt plugin: Support for memory allocation has been added. Thanks
          to Johan Wirén for his patch.
        * netapp plugin: Support for "SnapVault", "VFiler" and deduplication /
          compression and quota metrics. Thanks to Sebastian Harl for his
          patches and teamix GmbH for sponsoring this work.
        * postgresql plugin: The reconnection logic has been improved. Thanks
          to Sebastian Harl for his patches.
        * rrdtool, rrdcached plugins: The "CreateFilesAsync" option has been
          implemented. When enabled, new RRD files will be created
          asynchronously, which improved throughput of "server" instances.
          Many thanks to Yves Mettier for all his input and code.
        * tail_csv plugin: This new plugins allows to read metrics from CSV
          files, such as Snort's statistics file. Thanks to Kris Nielander for
          his patch.
        * write_mongodb plugin: Authentication options have been added.
        * write_riemann plugin: This new plugin allows sending metrics to
          Riemann, a stream processing and alerting tool. Big thanks to
          Pierre-Yves Ritschard for his work.

2013-04-08, Version 5.2.2
        * Build system: A bad interaction between the Java detection code and
          libltdl has been fixed. Thanks to Dave Cottlehuber for his patch.
          Installation of the Perl bindings has been improved / fixed. Thanks
          to Sebastian Harl for his patch.
        * collectd: Fixed read callback scheduling at startup.
        * apache, ascent, bind, curl, curl_json, curl_xml, nginx and
          write_http plugins: Portability fixes, protection from infinite
          redirect loops, improved error handling and incorrect dereferences
          have been fixed. Most of these are related to the cURL library.
          Thanks to Dan Fandrich for his patches.
        * logfile plugin: Flush the output file handle. This works around
          caching when logging to STDOUT and redirecting into a file. Thanks
          to Nathan Huff for the patch.
        * mysql plugin: Fix a memory leak in the error handling. Thanks to
          Tomas Doran for his patch.
        * netapp plugin: Fix the interval with which values are dispatched.
        * network plugin: Build issues under FreeBSD and initialization have
          been fixed. Thanks to Ed Schouten for his patch.
        * nfs plugin: A compilation problem has been fixed.
        * notify_email plugin: Add a character set to the mail header. Thanks
          to Manuel Cissé for his patch.
        * pf plugin: Build issues have been fixed.
        * postgresql plugin: Build issues have been fixed.
        * rrdcached plugin: Connect to the daemon from the read callback.
        * snmp plugin: Matching of SNMP subtrees has been improved. Thanks to
          "jkrabbe" for the patch.
        * thermal plugin: The initialization of dispatched value lists has
          been fixed. Thanks to Markus Knetschke for his patch.
        * unixsock plugin: Parsing of options with an underscore, e.g.
          "plugin_instance" has been fixed. Thanks to Tommie Gannert for his
          patch.

2013-01-27, Version 5.2.1
        * Build system: "make distcheck" has been fixed. Build fixes Solaris
          and systems without gcrypt. Thanks to Yves Mettier for his patches.
        * collectd: The complaint mechanism was fixed. It reported messages
          more frequently than intended.
        * collectd-tg: A manual page has been added.
        * dns plugin: Build issues on FreeBSD have been fixed. Thanks to
          Ed Schouten for his patch.
        * ethstat plugin: Fix the "Map" config option. An incorrectly used
          character pointer may lead to a segmentation fault.
        * network plugin: Build issues on FreeBSD have been fixed. Thanks to
          Ed Schouten for his patch.
        * postgresql plugin: A memory leak in the writing code has been fixed.
          A use-after-free issue that happened when more than one database was
          configured was fixed. Thanks to Sebastian Harl for fixing these
          problems.
        * redis plugin: A build failure has been fixed. Thanks to Pierre-Yves
          Ritschard for his patch.
        * varnish plugin: Fix a problem with instances without name.
        * write_graphite plugin: A regression which rendered the
          "SeparateInstances" and "AlwaysAppendDS" options unusable has been
          fixed. A failed assertion when using types with many data sources
          has been fixed. Improve reporting of connection errors to not spam
          log files too much. Thanks to Pierre-Yves Ritschard for reporting
          the logging problem.
        * zfs_arc plugin: Fix the type used for mutex misses. Thanks to Yves
          Mettier for reporting this bug.

2012-11-17, Version 5.2.0
        * collectd: The performance of the LISTVAL command has been improved.
          Thanks to Yves Mettier for the patch.
        * collectd: The possibility to configure the collection interval on a
          per-plugin basis has been added. Huge thanks to Sebastian Harl for
          his work.
        * collectd-tg: This new binary allows to generate random but real
          looking collectd network traffic. This can be used to load-test new
          plugin, for example.
        * libcollectdclient: Code for constructing and sending network packets
          in the binary format has been added.
        * aggregation plugin: This new plugin allows to aggregate multiple
          value lists into one.
        * amqp and write_http plugins: Meta data is now included in the JSON
          output format. Thanks to Mark Wong for the patch.
        * amqp plugin: Support for "Graphite" output has been added. Thanks to
          Thomas Meson for the patch.
        * contextswitch plugin: Support for AIX has been added. Thanks to
          Manuel Rozada for his patch.
        * disk plugin: The "UseBSDName" config option has been added to the
          Mac OS X version.
        * GenericJMX plugin: Automatically determine the host name if it isn't
          configured.
        * libvirt plugin: The "number" interface format has been added. Thanks
          to "Davide Guerri" for the patch.
        * memcached plugin: Support for multiple connections has been added.
          Thanks to Nicolas Szalay for the patch.
        * ntpd plugin: The "IncludeUnitID" config option has been added. The
          behavior when a peer is unreachable has been improved. Thanks to
          Johan Kiviniemi for the patches.
        * oracle plugin: The "Host" config option has been added.
        * pf plugin: This new plugin allows to collect statistics from BSD's
          packet filter "pf". Thanks to Pierre-Yves Ritschard and Stefan Rinkes
          for their work.
        * postgresql plugin: The "Instance" config option has been added.
          Support for writing values to a PostgreSQL database has been added.
          Thanks to Sebastian Harl for the patches.
        * processes plugin: Support for Solaris has been added. Thanks to
          Cosmin Ioiart for the patch.
        * redis plugin: Support for authenticating via password has been added.
          Thanks to biancalana for the patch.
        * rrdcached plugin: The "HeartBeat", "RRARows", "RRATimespan",
          "StepSize" and "XFF" config options have been added.
        * swap plugin: The "ReportBytes" config option has been added. The AIX
          version now also exports "reserved" pages and swap-in / swap-out
          "traffic". Thanks to Manuel Rozada for the patch.
        * tcpconns plugin: Use a netlink socket rather than reading from /proc
          for improved performance. Thanks to Michael Stapelberg for the patch.

2013-04-08, Version 5.1.3
        * Build system: A bad interaction between the Java detection code and
          libltdl has been fixed. Thanks to Dave Cottlehuber for his patch.
        * collectd: Fixed read callback scheduling at startup.
        * apache, ascent, bind, curl, curl_json, curl_xml, nginx and
          write_http plugins: Portability fixes, protection from infinite
          redirect loops, improved error handling and incorrect dereferences
          have been fixed. Most of these are related to the cURL library.
          Thanks to Dan Fandrich for his patches.
        * logfile plugin: Flush the output file handle. This works around
          caching when logging to STDOUT and redirecting into a file. Thanks
          to Nathan Huff for the patch.
        * mysql plugin: Fix a memory leak in the error handling. Thanks to
          Tomas Doran for his patch.
        * netapp plugin: Fix the interval with which values are dispatched.
        * network plugin: Build issues under FreeBSD and initialization have
          been fixed. Thanks to Ed Schouten for his patch.
        * nfs plugin: A compilation problem has been fixed.
        * notify_email plugin: Add a character set to the mail header. Thanks
          to Manuel Cissé for his patch.
        * rrdcached plugin: Connect to the daemon from the read callback.
        * snmp plugin: Matching of SNMP subtrees has been improved. Thanks to
          "jkrabbe" for the patch.
        * thermal plugin: The initialization of dispatched value lists has
          been fixed. Thanks to Markus Knetschke for his patch.
        * unixsock plugin: Parsing of options with an underscore, e.g.
          "plugin_instance" has been fixed. Thanks to Tommie Gannert for his
          patch.

2013-01-25, Version 5.1.2
        * Build system: "make distcheck" has been fixed. Thanks to Yves
          Mettier for his patches.
        * collectd: The complaint mechanism was fixed. It reported messages
          more frequently than intended.
        * dns plugin: Build issues on FreeBSD have been fixed. Thanks to
          Ed Schouten for his patch.
        * ethstat plugin: Fix the "Map" config option. An incorrectly used
          character pointer may lead to a segmentation fault.
        * network plugin: Build issues on FreeBSD have been fixed. Thanks to
          Ed Schouten for his patch.
        * varnish plugin: Fix a problem with instances without name.
        * write_graphite: Improve reporting of connection errors to not spam
          log files too much. Thanks to Pierre-Yves Ritschard for reporting
          this problem.
        * zfs_arc plugin: Fix the type used for mutex misses. Thanks to Yves
          Mettier for reporting this bug.

2012-11-11, Version 5.1.1
        * collectd: Create new directories with mode 0777 and let umask remove
          unwanted permission bits.
        * collectd: Build issues have been fixed.
        * collectd: An incorrect assertion has been fixed in some common code
          for Solaris. This should resolve pseudo-random assertion failures
          under Solaris. Thanks to Jeff Blane for his help debugging this.
        * collectd: A couple of memory leaks through PThread thread attributes
          have been fixed. Thanks to Gerrie Roos for fixing these.
        * collectdctl: Fix PUTVAL for data sets with multiple data sources.
          Thanks to Cyril Feraudet for reporting this problem.
        * contrib/migrate-4-5.px: Handle to "df" to "df_complex" conversion
          correctly.
        * apcups plugin: Improve the reconnect behavior.
        * curl_xml plugin: The "Host" setting was silently ignored. Thanks to
          Fabien Wernli for fixing this.
        * df plugin: Ignore "rootfs" devices under Linux to avoid having them
          reported twice. Thanks to Brune Prémont for fixing this.
        * disk plugin: Fix incorrect computation of read and write latency (the
          "disk_time" type). Previously, the numbers reported where too small
          by a factor of "interval", e.g. when the interval is set to 10
          seconds, the values were too low by a factor of 10. Thanks to Manuel
          Sanmartin for reporting this problem.
        * dns plugin: A build issue under Solaris has been fixed. A erroneous
          define that could lead to the reporting of bad data has been fixed by
          Daniel Sutto.
        * ethstat plugin: An off-by-one error and potential use of
          uninitialized memory has been fixed. Thanks to Mark Voelker for
          reporting these problems.
        * memcachec plugin: A bug in the configuration handling has been fixed.
          Thanks to Pascal Hofmann for fixing this issue.
        * mysql plugin: Fix a bug when registering multiple databases. Thanks
          to Sebastian Harl for fixing this.
        * netapp plugin: Correctly close the connection on communication
          errors.
        * netlink plugin: The function used to query statistics has been
          changed to be more in line with iproute2's behavior. Thanks to
          "KIvosak" for the patch.
        * network plugin: Initialization of libgcrypt has been fixed. Thanks to
          Chris Lundquist for his patch.
        * oracle plugin: Error messages have been improved.
        * ping plugin: Don't enter the exponential back-off mode when
          ping_send() fails. This should make recovery after a network failure
          much faster.
        * python plugin: Memory leaks have been fixed. Thanks to Tommie Gannert
          and Sven Trenkel for fixing this.
        * redis plugin: Fix a compilation problem on FreeBSD. Thanks to
          "biancalana" for the fix.
        * rrdtool plugin: Fix an out-of-bounds array access when printing a
          warning message. Thanks to Will Hawkins for fixing this bug.
        * snmp plugin: Support for the SNMP_ENDOFMIBVIEW return value has been
          added. Support for more complex / unusual MIBs / subtrees has been
          added. Thanks to Mark Juric to test the changes and point out these
          problems.
        * varnish plugin: Support for multiple instances of Varnish 3 has been
          fixed. Thanks to Jonathan Huot for the patch.
        * write_mongodb plugin: Add compatibility with libmongo 0.6.0 and
          later. Thanks to Chris Lundquist for this patch.

2012-04-01, Version 5.1.0
        * Build system, iptables plugin: The shipped version of libiptc has
          been removed.
        * collectd-nagios: A list of value lists can now be queried using
          "-n LIST". Thanks to Sebastian Harl for his patches.
        * bind plugin: The "ParseTime" option has been added. It allows to use
          the system time rather than the time reported by BIND.
        * curl, memcachec, tail plugins: The "ExcludeRegexp" option has been
          added. Thanks to Peter Warasin for his initial patch.
        * ethstat plugin: The new "ethstat" plugin reads performance statistics
          directly from ethernet cards. Thanks to Cyril Feraudet for his patch.
        * GenericJMX plugin: Support for querying MBean "Operations" (in
          addition to "Attributes") has been added. Thanks to Pierre-Yves
          Ritschard for his patch.
        * irq plugin: The selection / ignore code now uses the default
          ignorelist infrastructure, providing the standard feature set, e.g.
          regex matching.
        * md plugin: The new "md" plugin reports the number of disks in various
          states in Linux software RAID devices. Thanks to Michael Hanselmann
          for his patch.
        * modbus plugin: Support for signed integer register types has been
          added.
        * nfs plugin: Support for Solaris has been added. Thanks to Cosmin
          Ioiart for his patch.
        * numa plugin: The new "numa" plugin reports statistics of the
          Non-Uniform Memory Access (NUMA) subsystem of Linux.
        * processes plugin: Various fixes for the FreeBSD implementation.
          Thanks to Phil Kulin for his patch.
        * rrdcached plugin: Passing flushes to the caching daemon has been
          added.
        * sensors plugin: The initialization code has been improved. Thanks to
          Henrique de Moraes Holschuh for his patch.
        * swap plugin: The "ReportByDevice" option has been added.
        * syslog plugin: Support for writing notifications has been added.
          Thanks to Fabien Wernli for his patch.
        * tcpconns plugin: Support for AIX has been added. Thanks to Manuel
          Luis Sanmartín Rozada for his patch.
        * threshold plugin: The "PersistOK" option has been added. Thanks to
          Aaron Brady for his patch.
        * varnish plugin: Support for Varnish 3.0 has been added. Thanks to
          Jérôme Renard for his patches.
        * write_mongodb plugin: The new "write_mongodb" plugin writes value
          lists to MongoDB, a shema-less database. Thanks to Akkarit Sangpetch
          and Chris Lundquist for their work.
        * write_graphite plugin: The new "write_graphite" plugin writes value
          lists to Carbon, the storage layer of the Graphite time-series
          database. Thanks to Scott Sanders and Pierre-Yves Ritschard for their
          work.
        * zfs_arc plugin: Several new statistics have been added. Thanks to
          Aurelien Rougemont for his patches.
        * scale target: Support for scaling specific data sources only has been
          added. Thanks to Gerrie Roos for his patch.

2012-11-11, Version 5.0.5
        * collectd: Create new directories with mode 0777 and let umask remove
          unwanted permission bits.
        * collectd: Build issues have been fixed.
        * collectd: An incorrect assertion has been fixed in some common code
          for Solaris. This should resolve pseudo-random assertion failures
          under Solaris. Thanks to Jeff Blane for his help debugging this.
        * collectd: A couple of memory leaks through PThread thread attributes
          have been fixed. Thanks to Gerrie Roos for fixing these.
        * collectdctl: Fix PUTVAL for data sets with multiple data sources.
          Thanks to Cyril Feraudet for reporting this problem.
        * contrib/migrate-4-5.px: Handle to "df" to "df_complex" conversion
          correctly.
        * apcups plugin: Improve the reconnect behavior.
        * curl_xml plugin: The "Host" setting was silently ignored. Thanks to
          Fabien Wernli for fixing this.
        * df plugin: Ignore "rootfs" devices under Linux to avoid having them
          reported twice. Thanks to Brune Prémont for fixing this.
        * disk plugin: Fix incorrect computation of read and write latency (the
          "disk_time" type). Previously, the numbers reported where too small
          by a factor of "interval", e.g. when the interval is set to 10
          seconds, the values were too low by a factor of 10. Thanks to Manuel
          Sanmartin for reporting this problem.
        * dns plugin: A build issue under Solaris has been fixed. A erroneous
          define that could lead to the reporting of bad data has been fixed by
          Daniel Sutto.
        * memcachec plugin: A bug in the configuration handling has been fixed.
          Thanks to Pascal Hofmann for fixing this issue.
        * mysql plugin: Fix a bug when registering multiple databases. Thanks
          to Sebastian Harl for fixing this.
        * netapp plugin: Correctly close the connection on communication
          errors.
        * netlink plugin: The function used to query statistics has been
          changed to be more in line with iproute2's behavior. Thanks to
          "KIvosak" for the patch.
        * network plugin: Initialization of libgcrypt has been fixed. Thanks to
          Chris Lundquist for his patch.
        * oracle plugin: Error messages have been improved.
        * ping plugin: Don't enter the exponential back-off mode when
          ping_send() fails. This should make recovery after a network failure
          much faster.
        * python plugin: Memory leaks have been fixed. Thanks to Tommie Gannert
          and Sven Trenkel for fixing this.
        * redis plugin: Fix a compilation problem on FreeBSD. Thanks to
          "biancalana" for the fix.
        * rrdtool plugin: Fix an out-of-bounds array access when printing a
          warning message. Thanks to Will Hawkins for fixing this bug.
        * snmp plugin: Support for the SNMP_ENDOFMIBVIEW return value has been
          added. Support for more complex / unusual MIBs / subtrees has been
          added. Thanks to Mark Juric to test the changes and point out these
          problems.

2012-04-01, Version 5.0.4
        * Build system: Fix the use of a libltdl macro. Thanks to Clemens Lang
          for fixing this. Adresses some issues with building the iptables
          plugin under Gentoo.
        * libcollectdclient: A memory leak in the lcc_getval() function has
          been fixed. Thanks to Jason Schmidlapp for finding and fixing this
          issue.
        * bind plugin: The use of 'QType" types has been fixed.
        * df plugin: Fixed compiler issue under Mac OS X 10.7.
        * conntrack plugin: Support zero as legitimate value. Thanks to Louis
          Opter for his patch.
        * memcached plugin: Increased the size of a static buffer, which was
          truncating status messages form memcached. Thanks to Timon for the
          patch.
        * network plugin: Forwarding of notifications has been disabled. This
          was a contition not checked for before, which may retult in an
          endless loop.
        * processes plugin: Support for process names with spaces has been
          added to the Linux implementation. Thanks to Darrell Bishop for his
          patch.
        * perl plugin: A race condition in several callbacks, including log and
          write callbacks, has been fixed. Thanks to "Rrpv" for reporting this
          bug.
        * snmp plugin: A bug when casting unsigned integers to gauge values has
          been fixed: Unsigned integers would be cast to a signed integer and
          then to a gauge, possibly resulting in a negative value.
        * tcpconns plugin: Compilation with newer versions of the FreeBSD
          runtime has been fixed.

2012-02-19, Version 5.0.3
        * Build system: Fix problems when building the ipvs and iptables
          plugins. Thanks to Sebastian Harl for his patch. A bashism in the
          version-gen.sh script has been fixed. Thanks to Jo-Philipp Wich for
          his patch.
        * csv and rrdtool plugins: Print a more helpful error message when the
          DataDir is a symlink pointing to a non-existing location. Thanks to
          Jonathan Nieder for his patch.
        * exec plugin: Fix a problem when using select(2) to read from file
          handles. Thanks to Gerrie Roos for his patch.
        * network plugin: An incorrect error message in the handling of the
          "Interface" configuration option has been fixed. Thanks to Gerrie
          Roos for his patch.
        * oracle plugin: A potential endless loop in the error handling has
          been fixed.
        * python plugin: A crash bug in the configuration handling has been
          fixed. Thanks to Sven Trenkel for his patch.
        * interfaces plugin: The change which was supposed to ignore "bogus"
          interfaces has been reverted, since it ignored legit interfaces, such
          as bonding pseudo-devices as well.

2012-01-21, Version 5.0.2
        * curl_xml plugin: Fix handling of file:// and other URLs (which don't
          follow HTTP status codes). Thanks to Fabien Wernli for his patch!
        * df plugin: Fix handling of negative "available" counts. This can
          occur with some file systems, for example UFS. Thanks to Toni Ylenius
          for his patch.
        * interface plugin: "mac" interfaces are now ignored on Solaris. These
          pseudo-interfaces occur multiple times, causing warnings. Also switch
          to 64-bit counters on Solaris, improving overflow behavior for
          high-speed interfaces. Thanks to Eddy Geez and Fabien Wernli for
          their patches.
        * memory plugin: Account kernel and unused memory under Solaris. Thanks
          to Fabien Wernli for his patch.
        * network plugin: A bug in the interaction between the Network plugin
          and filter chains has been fixed: When a filter modified a field such
          as the hostname, subsequent values in the same network packets could
          have ended up using the modified name rather than the original name.
          Thanks to Sebastian Harl for identifying the problem.
        * oracle plugin: A memory leak has been fixed in the parameter handling.
        * python plugin: A memory leak has been fixed. Thanks to Sven Trenkel
          for fixing this bug!

2011-10-07, Version 5.0.1
        * collectd: A mutex leak has been fixed in the meta data code. Thanks
          to Rafal Lesniak for his patch.
        * collectd: Compatibility fixes for GCC 4.6 have been applied. Thanks
          to Peter Green for his patch.
        * csv plugin: The line buffer size has been increased. Thanks to Colin
          McCabe for the patch.
        * curl_json plugin: Don't use the "parent" node to build the type
          instance, if it is empty. Compatibility with libyajl 2 has been
          added. Thanks to "spupykin" of the Arch Linux project for the initial
          code. Formatting of time has been fixed in the JSON module.
        * exec plugin: Fix the timestamp value passed to notification scripts.
          Thanks to Alexander Kovalenko for fixing this.
        * iptables plugin: Fix linking with some versions of libiptc.
        * irq plugin: Fix support for interrupts under Linux. The old code
          assumed that interrupts have a numeric value -- this is no longer
          true for Linux. Thanks to Bostjan Skufca for implementing this.
        * notify_desktop plugin: Compatibility with libnotify 0.7 has been
          added. Thanks to Samuli Suominen for his patch.
        * processes plugin: Fix handling of regular expressions containing
          spaces. Thanks for Sebastian Harl for fixing this.
        * rrdtool, rrdcached plugins: Improve precision of the XFF parameter.
          Previously, values like 0.999 would have been rounded to 1.0. Thanks
          to Francois-Xavier Bourlet for fixing this.
        * varnish plugin: Fix data type handling of some metrics. Some values
          were submitted as gauge even though they were derives.
        * Various plugin: Set a multi-threading flag in libcurl. Thanks to Mike
          Flisher for the fix.

2011-03-28, Version 5.0.0
        * collectd: The "FQDNLookup" option is now enabled by default.
        * collectd: The internal representation of time has been changed to
          allow a higher accuracy than one second.
        * collectdcmd: This new command line utility can send various commands
          to collectd using the UnixSock plugin. Thanks to Håkon Dugstad
          Johnsen and Sebastian Harl for their code.
        * collectd-nagios: The "-m" option has been implemented (treat NaNs as
          critical).
        * collectd-tg: Traffic generator creating bogus network traffic
          compatible to the Network plugin. This utility can be used to
          stress-test new write plugins and collectd in general.
        * libcollectdclient: Creating and sending network packets has been
          added to the collectd client library.
        * All data sets: The data source name of all data sets with exactly
          one data source has been changed to "value".
        * All plugins: All "counter" data sources have been converted to
          "derive" data sources. All plugins now use "derive" by default, but
          plugins such as the network plugin can still handle "counter", of
          course. The minimum value of all derive data sources is zero, the
          maximum value is unspecified.
        * amqp plugin: The new AMQP plugin can send data to and receive data
          from an AMQP broker. Thanks to Sebastien Pahl for his code.
        * apache plugin: Backwards compatibility code has been removed.
          Support for the IBM HTTP Server has been added. Thanks to Manuel
          Luis Sanmartín Rozada for his patch.
        * contextswitch plugin: Support for sysctlbyname(3) has been added.
          Thanks to Kimo Rosenbaum for his patch.
        * df plugin: The default behavior has been changed to be equivalent to
          the "ReportReserved" behavior of v4.
        * dns plugin: Improved RFC 1035 name parsing has been imported from
          "dnstop".
        * exec plugin: Backwards compatibility code has been removed.
        * GenericJMX plugin: The "InstancePrefix" option has been added to
          "Connection" blocks.
        * hddtemp plugin: The "TranslateDevicename" config option has been
          removed.
        * interface plugin: Use the "plugin instance" to store the interface
          value.
        * libvirt plugin: The "InterfaceFormat" option has been added. Thanks
          to Ruben Kerkhof for his patch.
        * lpar plugin: New plugins for "logical partitions", a virtualization
          technique of POWER CPUs. Thanks to Aurélien Reynaud for his code and
          patience.
        * modbus plugin: Support for libmodbus 2.9.2 has been added and the
          license has been changed to LGPLv2.1.
        * mysql plugin: Backwards compatibility code has been removed. The
          data sets used have been improved.
        * network plugin: The default buffer size has been increased to
          1452 bytes.
        * perl plugin: Backwards compatibility code has been removed.
        * postgresql plugin: Backwards compatibility code has been removed.
        * redis plugin: Plugin for collecting statistics from Redis, a key-
          value store, has been added. Thanks to Andres J. Diaz for his code.
        * swap plugin: Implement collection of physical and virtual memory
          statistics under Solaris. The new default is collecting physical
          memory. Thanks to Aurélien Reynaud for his patches.
        * threshold plugin: The threshold configuration has been moved into
          this separate plugin.
        * unixsock plugin: The "DeleteSocket" option has been added.
        * varnish plugin: The new Varnish plugin reads statistics from
          Varnish, a web accelerator. Thanks to Jérôme Renard and Marc
          Fournier for their contributions.
        * write_redis: New plugin for writing data to Redis, a key-value
          store.
        * zfs_arc plugin: The data sets have been replaced by more elegant
          alternatives.
        * v5upgrade target: Target for converting v4 data sets to the v5
          schema.

2013-04-07, Version 4.10.9
        * Build system: A bad interaction between the Java detection code and
          libltdl has been fixed. Thanks to Dave Cottlehuber for his patch.
        * apache, ascent, bind, curl, curl_json, curl_xml, nginx and
          write_http plugins: Portability fixes, protection from infinite
          redirect loops, improved error handling and incorrect dereferences
          have been fixed. Most of these are related to the cURL library.
          Thanks to Dan Fandrich for his patches.
        * logfile plugin: Flush the output file handle. This works around
          caching when logging to STDOUT and redirecting into a file. Thanks
          to Nathan Huff for the patch.
        * network plugin: Build issues under FreeBSD and initialization have
          been fixed. Thanks to Ed Schouten for his patch.
        * mysql plugin: Fix a memory leak in the error handling. Thanks to
          Tomas Doran for his patch.
        * thermal plugin: The initialization of dispatched value lists has
          been fixed. Thanks to Markus Knetschke for his patch.
        * unixsock plugin: Parsing of options with an underscore, e.g.
          "plugin_instance" has been fixed. Thanks to Tommie Gannert for his
          patch.

2012-11-11, Version 4.10.8
        * collectd: Create new directories with mode 0777 and let umask remove
          unwanted permission bits.
        * collectd: Build issues have been fixed.
        * collectd: An incorrect assertion has been fixed in some common code
          for Solaris. This should resolve pseudo-random assertion failures
          under Solaris. Thanks to Jeff Blane for his help debugging this.
        * collectd: A couple of memory leaks through PThread thread attributes
          have been fixed. Thanks to Gerrie Roos for fixing these.
        * apcups plugin: Improve the reconnect behavior.
        * df plugin: Ignore "rootfs" devices under Linux to avoid having them
          reported twice. Thanks to Brune Prémont for fixing this.
        * disk plugin: Fix incorrect computation of read and write latency (the
          "disk_time" type). Previously, the numbers reported where too small
          by a factor of "interval", e.g. when the interval is set to 10
          seconds, the values were too low by a factor of 10. Thanks to Manuel
          Sanmartin for reporting this problem.
        * dns plugin: A build issue under Solaris has been fixed. A erroneous
          define that could lead to the reporting of bad data has been fixed by
          Daniel Sutto.
        * memcachec plugin: A bug in the configuration handling has been fixed.
          Thanks to Pascal Hofmann for fixing this issue.
        * netapp plugin: Correctly close the connection on communication
          errors.
        * netlink plugin: The function used to query statistics has been
          changed to be more in line with iproute2's behavior. Thanks to
          "KIvosak" for the patch.
        * network plugin: Initialization of libgcrypt has been fixed. Thanks to
          Chris Lundquist for his patch.
        * oracle plugin: Error messages have been improved.
        * ping plugin: Don't enter the exponential back-off mode when
          ping_send() fails. This should make recovery after a network failure
          much faster.
        * python plugin: Memory leaks have been fixed. Thanks to Tommie Gannert
          and Sven Trenkel for fixing this.
        * rrdtool plugin: Fix an out-of-bounds array access when printing a
          warning message. Thanks to Will Hawkins for fixing this bug.
        * snmp plugin: Support for the SNMP_ENDOFMIBVIEW return value has been
          added. Support for more complex / unusual MIBs / subtrees has been
          added. Thanks to Mark Juric to test the changes and point out these
          problems.

2012-04-01, Version 4.10.7
        * Build system: Fix the use of a libltdl macro. Thanks to Clemens Lang
          for fixing this. Adresses some issues with building the iptables
          plugin under Gentoo.
        * libcollectdclient: A memory leak in the lcc_getval() function has
          been fixed. Thanks to Jason Schmidlapp for finding and fixing this
          issue.
        * bind plugin: The use of 'QType" types has been fixed.
        * df plugin: Fixed compiler issue under Mac OS X 10.7.
        * conntrack plugin: Support zero as legitimate value. Thanks to Louis
          Opter for his patch.
        * memcached plugin: Increased the size of a static buffer, which was
          truncating status messages form memcached. Thanks to Timon for the
          patch.
        * network plugin: Forwarding of notifications has been disabled. This
          was a contition not checked for before, which may retult in an
          endless loop.
        * processes plugin: Support for process names with spaces has been
          added to the Linux implementation. Thanks to Darrell Bishop for his
          patch.
        * perl plugin: A race condition in several callbacks, including log and
          write callbacks, has been fixed. Thanks to "Rrpv" for reporting this
          bug.
        * snmp plugin: A bug when casting unsigned integers to gauge values has
          been fixed: Unsigned integers would be cast to a signed integer and
          then to a gauge, possibly resulting in a negative value.
        * tcpconns plugin: Compilation with newer versions of the FreeBSD
          runtime has been fixed.

2012-02-19, Version 4.10.6
        * Build system: Fix problems when building the ipvs and iptables
          plugins. Thanks to Sebastian Harl for his patch. A bashism in the
          version-gen.sh script has been fixed. Thanks to Jo-Philipp Wich for
          his patch.
        * csv and rrdtool plugins: Print a more helpful error message when the
          DataDir is a symlink pointing to a non-existing location. Thanks to
          Jonathan Nieder for his patch.
        * exec plugin: Fix a problem when using select(2) to read from file
          handles. Thanks to Gerrie Roos for his patch.
        * network plugin: An incorrect error message in the handling of the
          "Interface" configuration option has been fixed. Thanks to Gerrie
          Roos for his patch.
        * oracle plugin: A potential endless loop in the error handling has
          been fixed.
        * python plugin: A crash bug in the configuration handling has been
          fixed. Thanks to Sven Trenkel for his patch.
        * interfaces plugin: The change which was supposed to ignore "bogus"
          interfaces has been reverted, since it ignored legit interfaces, such
          as bonding pseudo-devices as well.

2012-01-21, Version 4.10.5
        * curl_xml plugin: Fix handling of file:// and other URLs (which don't
          follow HTTP status codes). Thanks to Fabien Wernli for his patch!
        * df plugin: Fix handling of negative "available" counts. This can
          occur with some file systems, for example UFS. Thanks to Toni Ylenius
          for his patch.
        * interface plugin: "mac" interfaces are now ignored on Solaris. These
          pseudo-interfaces occur multiple times, causing warnings. Also switch
          to 64-bit counters on Solaris, improving overflow behavior for
          high-speed interfaces. Thanks to Eddy Geez and Fabien Wernli for
          their patches.
        * memory plugin: Account kernel and unused memory under Solaris. Thanks
          to Fabien Wernli for his patch.
        * network plugin: A bug in the interaction between the Network plugin
          and filter chains has been fixed: When a filter modified a field such
          as the hostname, subsequent values in the same network packets could
          have ended up using the modified name rather than the original name.
          Thanks to Sebastian Harl for identifying the problem.
        * oracle plugin: A memory leak has been fixed in the parameter handling.
        * python plugin: A memory leak has been fixed. Thanks to Sven Trenkel
          for fixing this bug!

2011-10-14, Version 4.10.4
        * collectd: A mutex leak has been fixed in the meta data code. Thanks
          to Rafal Lesniak for his patch.
        * collectd: Compatibility fixes for GCC 4.6 have been applied. Thanks
          to Peter Green for his patch.
        * csv plugin: The line buffer size has been increased. Thanks to Colin
          McCabe for the patch.
        * curl_json plugin: Don't use the "parent" node to build the type
          instance, if it is empty. Compatibility with libyajl 2 has been
          added. Thanks to "spupykin" of the Arch Linux project for the initial
          code.
        * iptables plugin: Fix linking with some versions of libiptc.
        * irq plugin: Fix support for interrupts under Linux. The old code
          assumed that interrupts have a numeric value -- this is no longer
          true for Linux. Thanks to Bostjan Skufca for implementing this.
        * notify_desktop plugin: Compatibility with libnotify 0.7 has been
          added. Thanks to Samuli Suominen for his patch.
        * processes plugin: Fix handling of regular expressions containing
          spaces. Thanks for Sebastian Harl for fixing this.
        * rrdtool, rrdcached plugins: Improve precision of the XFF parameter.
          Previously, values like 0.999 would have been rounded to 1.0. Thanks
          to Francois-Xavier Bourlet for fixing this.
        * Various plugin: Set a multi-threading flag in libcurl. Thanks to Mike
          Flisher for the fix.

2011-03-26, Version 4.10.3
        * Documentation: Several updates and additions. Thanks to Sebastian Harl.
        * collectd: Build issues (compiler warnings) have been fixed. Thanks to
          Bruno Prémont.
        * collectd: Threshold subsection: Handling of NAN values in the
          percentage calculation has been fixed.
        * collectd, java plugin, ntpd plugin: Several diagnostic messages have
          been improved.
        * curl_json plugin: Handling of arrays has been fixed.
        * libvirt plugin: A bug in reading the virtual CPU statistics has been
          fixed. Thanks to “JLPC” for reporting this problem.
        * modbus plugin: Compatibility with libmodbus 2.0.3 has been restored.
        * processes plugin: Potentially erroneous behavior has been fixed in an
          error handling case.
        * python plugin: Fix dispatching of values from Python scripts to
          collectd. Thanks to Gregory Szorc for finding and fixing this
          problem.

2010-11-27, Version 4.10.2
        * Documentation: Various documentation fixes.
        * collectd: If including one configuration file fails, continue with
          the rest of the configuration if possible.
        * collectd: Fix a bug in the read function scheduling. In rare cases
          read functions may not have been called as often as requested.
        * collectd: Concurrency issues with errno(3) under AIX have been
          fixed: A thread-safe version of errno has to be requested under AIX.
          Thanks to Aurélien Reynaud for his patch.
        * collectd: A left-over hard-coded 2 has been replaced by the
          configurable timeout value.
        * curl, memcachec, tail plugins: Fix handling of "DERIVE" data
          sources. Matching the end of a string has been improved; thanks to
          Sebastian Harl for the patch.
        * curl_json plugin: Fix a problem when parsing 64bit integers. Reading
          JSON data from non-HTTP sources has been fixed.
        * netapp plugin: Pass the interval setting to the dispatch function.
          Restore compatibility to NetApp Release 7.3. Thanks to Sven Trenkel
          for the patch.
        * network plugin: Be less verbose about unchecked signatures, in order
          to prevent spamming the logs.
        * notify_email plugin: Concurrency problems have been fixed.
        * python plugin: Set "sys.argv", since many scripts don't expect that
          it may not be set. Thanks to Sven Trenkel for the patch.
        * rrdtool, rrdcached plugin: Fix a too strict assertion when creating
          RRD files.
        * swap plugin: A bug which lead to incorrect I/O values has been
          fixed.
        * value match: A minor memory leak has been fixed. Thanks to Sven
          Trenkel for the patch.

2010-07-09, Version 4.10.1
        * Build system: Checking for "strtok_r" under Solaris has been fixed.
        * Portability: Fixes for Solaris 8 have been applied. Thanks to
          Alexander Wuerstlein for his patch.
        * collectd: The shutdown speed when terminating the read threads has
          been improved.
        * libcollectdclient: A format error in the PUTVAL command has been
          removed. Thanks to Johan Van den Brande for fixing this.
        * df plugin: An error message shown when "cu_mount_getlist" fails has
          been added.
        * processes plugin: Missing initialization code for IO members of a
          struct has been added. Thanks to Aurélien Reynaud for fixing this.
        * python plugin: Memory leaks in the write and notification callbacks
          have been fixed. A possible crash when the plugin was loaded but not
          configured has been fixed. Thanks to Sven Trenkel for his patches.
        * snmp plugin: Verbosity with regard to unknown ASN types has been
          increased. A build problem on PowerPC and ARM processors has been
          fixed by Aurélien Reynaud; thanks!
        * powerdns plugin: Compatibility changes for PowerDNS 2.9.22 and above
          have been applied. Thanks to Luke Heberling for his changes.

2010-05-01, Version 4.10.0
        * collectd: JSON output now includes the "dstypes" and "dsnames"
          fields. This makes it easier for external applications to interpret
          the data. Thanks to Chris Buben for his work.
        * collectd: The new "Timeout" option can be used to specify a
          "timeout" for missing values. This is used in the threshold checking
          code to detect missing values. Thanks to Andrés J. Díaz for the
          patch.
        * apache plugin: Support for "IdleWorkers" (Apache 1.*: "IdleServers")
          has been added.
        * curl plugin: The new "ExcludeRegex" allows to easily exclude certain
          lines from the match.
        * curl_xml plugin: This new plugin allows to read XML files using cURL
          and extract metrics included in the files. Thanks to Amit Gupta for
          his work.
        * filecount plugin: The new "IncludeHidden" option allows to include
          "hidden" files and directories in the statistics. Thanks to Vaclav
          Malek for the patch.
        * logfile plugin: The new "PrintSeverity" option allows to include the
          severity of a message in the output. Thanks to Clément Stenac for
          his patch.
        * memcachec plugin: The new "ExcludeRegex" allows to easily exclude
          certain lines from the match.
        * modbus plugin: This new plugin allows to read registers from
          Modbus-TCP enabled devices.
        * network plugin: The new "Interface" option allows to set the
          interface to be used for multicast and, if supported, unicast
          traffic. Thanks to Max Henkel for his work.
        * openvpn plugin: The "CollectUserCount" and "CollectIndividualUsers"
          options allow more detailed control over how to report sessions of
          multiple users. Thanks to Fabian Schuh for his work.
        * pinba plugin: This new plugin receives timing information from the
          Pinba PHP extension, which can be used for profiling PHP code and
          webserver performance. Thanks to Phoenix Kayo for his work.
        * ping plugin: The new "MaxMissed" allows to re-resolve a hosts
          address when it doesn't reply to a number of ping requests. Thanks
          to Stefan Völkel for the patch.
        * postgresql plugin: The "Interval" config option has been added. The
          plugin has been relicensed under the 2-clause BSD license. Thanks to
          Sebastian Harl for his work.
        * processes plugin: Support for "code" and "data" virtual memory sizes
          has been added. Thanks to Clément Stenac for his patch.
        * python plugin: Support for Python 3 has been implemented. Thanks to
          Sven Trenkel for his work.
        * routeros plugin: Support for collecting CPU load, memory usage, used
          and free disk space, sectors written and number of bad blocks from
          MikroTik devices has been added.
        * swap plugin: Support for Linux < 2.6 has been added. Thanks to Lorin
          Scraba for his patch.
        * tail plugin: The new "ExcludeRegex" allows to easily exclude certain
          lines from the match. Thanks to Peter Warasin for his patch.
        * write_http plugin: The "StoreRates" option has been added. Thanks to
          Paul Sadauskas for his patch.
        * regex match: The "Invert" option has been added. Thanks to Julien
          Ammous for his patch.

2011-03-26, Version 4.9.5
        * Documentation: Several updates and additions. Thanks to Sebastian Harl.
        * collectd: Build issues (compiler warnings) have been fixed. Thanks to
          Bruno Prémont.
        * collectd: Threshold subsection: Handling of NAN values in the
          percentage calculation has been fixed.
        * collectd, java plugin, ntpd plugin: Several diagnostic messages have
          been improved.
        * libvirt plugin: A bug in reading the virtual CPU statistics has been
          fixed. Thanks to “JLPC” for reporting this problem.
        * processes plugin: Potentially erroneous behavior has been fixed in an
          error handling case.
        * python plugin: Fix dispatching of values from Python scripts to
          collectd. Thanks to Gregory Szorc for finding and fixing this
          problem.

2010-11-27, Version 4.9.4
        * Documentation: Various documentation fixes.
        * collectd: If including one configuration file fails, continue with
          the rest of the configuration if possible.
        * collectd: Fix a bug in the read function scheduling. In rare cases
          read functions may not have been called as often as requested.
        * collectd: Concurrency issues with errno(3) under AIX have been
          fixed: A thread-safe version of errno has to be requested under AIX.
          Thanks to Aurélien Reynaud for his patch.
        * curl, memcachec, tail plugins: Fix handling of "DERIVE" data
          sources. Matching the end of a string has been improved; thanks to
          Sebastian Harl for the patch.
        * curl_json plugin: Fix a problem when parsing 64bit integers. Reading
          JSON data from non-HTTP sources has been fixed.
        * netapp plugin: Pass the interval setting to the dispatch function.
          Restore compatibility to NetApp Release 7.3. Thanks to Sven Trenkel
          for the patch.
        * network plugin: Be less verbose about unchecked signatures, in order
          to prevent spamming the logs.
        * notify_email plugin: Concurrency problems have been fixed.
        * python plugin: Set "sys.argv", since many scripts don't expect that
          it may not be set. Thanks to Sven Trenkel for the patch.
        * rrdtool, rrdcached plugin: Fix a too strict assertion when creating
          RRD files.
        * value match: A minor memory leak has been fixed. Thanks to Sven
          Trenkel for the patch.

2010-07-09, Version 4.9.3
        * Build system: Checking for "strtok_r" under Solaris has been fixed.
        * Portability: Fixes for Solaris 8 have been applied. Thanks to
          Aurélien Reynaud and Alexander Wuerstlein for their patches.
        * collectd: The shutdown speed when terminating the read threads has
          been improved.
        * collectd-nagios: The format of the performance data has been fixed.
        * libcollectdclient: A format error in the PUTVAL command has been
          removed. Thanks to Johan Van den Brande for fixing this.
        * df plugin: An error message shown when "cu_mount_getlist" fails has
          been added.
        * processes plugin: Missing initialization code for IO members of a
          struct has been added. Thanks to Aurélien Reynaud for fixing this.
        * python plugin: Memory leaks in the write and notification callbacks
          have been fixed. A possible crash when the plugin was loaded but not
          configured has been fixed. Thanks to Sven Trenkel for his patches.
        * rrdcached plugin: A build issue has been resolved. Thanks to
          Thorsten von Eicken for the patch.
        * snmp plugin: Verbosity with regard to unknown ASN types has been
          increased. A build problem on PowerPC and ARM processors has been
          fixed by Aurélien Reynaud; thanks!
        * powerdns plugin: Compatibility changes for PowerDNS 2.9.22 and above
          have been applied. Thanks to Luke Heberling for his changes.

2010-04-22, Version 4.9.2
        * Build system, various plugins: Fixes for AIX compatibility have been
          added. Thanks to Manuel Sanmartin for his patches.
        * Build system: Checking for "nanosleep" on old Solaris machines has
          been fixed. Thanks to Vincent McIntyre and Sebastian Harl for
          figuring out a way to make this work.
        * collectd: Append a newline to messages written to STDERR.
        * collectd: Serialization of NANs in JSON format has been fixed.
          Thanks to Chris Buben for pointing out the resulting syntax error.
        * collectd: Checks whether a "sleep" returned early have been added;
          the cases are now handled correctly. Thanks to Michael Stapelberg
          for the patch.
        * collectd: Continue reading files in a directory when parsing one
          file fails.
        * apache plugin: Collection of the number of active connections has
          been fixed for Apache 2.*.
        * contextswitch plugin: Handle large counter/derive values correctly.
          Thanks to Martin Merkel for reporting the bug.
        * exec plugin: Error messages have been improved. The "running" flag
          is now cleared correctly when forking a child fails.
        * iptables plugin: Fix a violation of aliasing rules. This resolves a
          warning / error with new GCC versions. Thanks to Jan Engelhardt for
          the work-around.
        * java plugin: The Java API files are now packaged into a .jar file.
          Thanks to Amit Gupta for his patch.
        * network plugin: Fix a segmentation fault when receiving packets with
          an unknown data source type.
        * network plugin: A memory leak when receiving encrypted network
          packets has been fixed.
        * openvpn plugin: Fix naming schema when reading "MULTI1" type status
          files.
        * oracle plugin: Fix checking for lost connections and reconnect in
          this case. Thanks to Sven Trenkel for pointing out the problem.
        * unixsock plugin: A memory leak in the "LISTVAL" command has been
          fixed. Thanks to Peter Warasin for pointing it out.
        * write_http plugin: Use the "any" authentication schema. This used to
          be "digest". Thanks to Paul Sadauskas for the patch.

2010-01-14, Version 4.9.1
        * Documentation: Some manpage fixes.
        * Default config: Added sample configuration for missing plugins.
        * apache plugin: Fix a segmentation fault in the config handling of
          VerifyPeer / VerifyHost. Thanks to "plazmus" for his or her patch.
        * processes plugin: Fix handling of derive data sources.
        * rrdtool plugin: Fix a bug with random write timeouts. Due to an
          incorrect initialization some files may be suspended basically
          indefinitely. After flushing the files they were written regularly
          again.
        * routeros plugin: Use the node name for the "host" field.
        * Monitorus.pm: Put the plugin into the "Collectd::Plugins" namespace.
        * Perl bindings: Fix a warning that was printed when building
          debugging output.

2009-12-21, Version 4.9.0
        * contextswitch plugin: The new ContextSwitch plugin gathers the
          number of context switches done by the CPU. Thanks to Patrik
          Weiskircher for the patch.
        * cpu plugin: Support for SMP (multiple processors) under FreeBSD has
          been added. Thanks to Doug MacEachern for the patch.
        * curl plugin: The “MeasureResponseTime” option has been added. Thanks
          to Aman Gupta for the patch.
        * df plugin: Collecting the inode count and reserved space has been
          added. Thanks to Patrik Weiskircher for the patch.
        * exec plugin: The environment variables “COLLECTD_INTERVAL” and
          “COLLECTD_HOSTNAME” are now set before executing the application.
        * Monitorus plugin: This Perl-based plugin to query statistics from
          mon.itor.us has been added. Thanks to Jeff Green for the patch.
        * netapp plugin: New plugin to collect statistics from NetApp filers.
          Thanks to Sven Trenkel of the noris network AG for the patch.
        * network plugin: Statistics collection about the plugin itself has
          been implemented.
        * openvpn plugin: Add support for more versions of the “status file”.
          Thanks to Marco Chiappero for the patch.
        * OpenVZ plugin: This Perl-based plugin to gather OpenVZ statistics
          has been added. Thanks to Jonathan Kolb for the patch.
        * ping plugin: The config options "SourceAddress" and "Device"
          have been added. Thanks to Sebastian Harl for the patch.
        * processes plugin: Collection of IO-metrics has been added. Thanks to
          Andrés J. Díaz for the patch.
        * python plugin: The new Python plugin integrates a Python interpreter
          into collectd and allows to execute plugins written in the scripting
          language. Thanks to Sven Trenkel for his work.
        * routeros plugin: The new RouterOS plugin queries interface and
          wireless registration statistics from RouterOS.
        * Various plugins: AIX support has been added to the cpu, disk,
          interface, load, memory, processes, and swap plugins. Thanks to
          Manuel Sanmartin for his patches.
        * hashed match: This match for simple load balancing and redundant
          storage has been added.
        * scale target: This target to scale (multiply) values by an arbitrary
          value has been added.

2010-04-22, Version 4.8.5
        * collectd: Append a newline to messages written to STDERR.
        * network plugin: Fix a segmentation fault when receiving packets with
          an unknown data source type.

2010-04-07, Version 4.8.4
        * Build system, various plugins: Fixes for AIX compatibility have been
          added. Thanks to Manuel Sanmartin for his patches.
        * Build system: Checking for "nanosleep" on old Solaris machines has
          been fixed. Thanks to Vincent McIntyre and Sebastian Harl for
          figuring out a way to make this work.
        * collectd: Serialization of NANs in JSON format has been fixed.
          Thanks to Chris Buben for pointing out the resulting syntax error.
        * collectd: Checks whether a "sleep" returned early have been added;
          the cases are now handled correctly. Thanks to Michael Stapelberg
          for the patch.
        * collectd: Continue reading files in a directory when parsing one
          file fails.
        * apache plugin: Collection of the number of active connections has
          been fixed for Apache 2.*.
        * exec plugin: Error messages have been improved. The "running" flag
          is now cleared correctly when forking a child fails.
        * iptables plugin: Fix a violation of aliasing rules. This resolves a
          warning / error with new GCC versions. Thanks to Jan Engelhardt for
          the work-around.
        * java plugin: The Java API files are now packaged into a .jar file.
          Thanks to Amit Gupta for his patch.
        * network plugin: A memory leak when receiving encrypted network
          packets has been fixed.
        * oracle plugin: Fix checking for lost connections and reconnect in
          this case. Thanks to Sven Trenkel for pointing out the problem.
        * unixsock plugin: A memory leak in the "LISTVAL" command has been
          fixed. Thanks to Peter Warasin for pointing it out.
        * write_http plugin: Use the "any" authentication schema. This used to
          be "digest". Thanks to Paul Sadauskas for the patch.

2010-01-14, Version 4.8.3
        * Documentation: Some manpage fixes.
        * rrdtool plugin: Fix a bug with random write timeouts. Due to an
          incorrect initialization some files may be suspended basically
          indefinitely. After flushing the files they were written regularly
          again.

2009-12-18, Version 4.8.2
        * Build system, java plugin: Don't use “find -L” to search for Java
          headers, because it's a GNU extension.
        * Build system: Support for parallel builds has been improved. Thanks
          Sebastian Harl and Stefan Völkel for looking into this.
        * collectd: Print error messages to STDERR if no log plugin has been
          loaded.
        * genericjmx plugin: Close and re-open the connection upon I/O-errors.
        * gmond plugin: Fix typos which caused syntax errors.
        * memory plugin: Handling of >4 Gbyte of memory has been fixed.
        * network plugin: The license has been changed to LGPL 2.1.
        * oracle plugin: Reconnect to the database if the connection dies.
        * rrdcached plugin: Work-around for a bug in RRDtool 1.4rc2 has been
          added.
        * snmp plugin: Handling of negative values has been fixed. Strings
          containing control characters are now interpreted as hex-strings.
        * unixsock plugin: A memory leak in the LISTVAL command has been
          fixed. Thanks to Ben Knight for his patch.

2009-10-04, Version 4.8.1
        * Build system: Issues when building the iptables plugin have been
          fixed.
        * exec plugin: Clear the signal block mask before calling exec(2).
        * perl plugin: Declare the “environ” variable. This solves build
          issues on some platforms.
        * processes plugin: Remove unnecessary call of realloc(3). Thanks to
          Andrés J. Díaz for the patch.
        * unixsock plugin: Fix a (well hidden) race condition related to file
          descriptor handling.

2009-09-13, Version 4.8.0
        * collectd: Two new data source types, “DERIVE” and “ABSOLUTE”, have
          been added. “DERIVE” can be used for counters that are reset
          occasionally. Thanks to Mariusz Gronczewski for implementing this.
        * thresholds: The advanced threshold options “Percentage”, “Hits”, and
          “Hysteresis” have been added. Thanks to Andrés J. Díaz for his
          patches.
        * curl_json plugin: The new cURL-JSON plugin reads JSON files using
          the cURL library and parses the contents according to user
          specification. Among other things, this allows to read statistics
          from a CouchDB instance. Thanks to Doug MacEachern for the patch.
        * df plugin: Using the new “ReportByDevice” option the device rather
          than the mount point can be used to identify partitions. Thanks to
          Paul Sadauskas for the patch.
        * dns plugin: The possibility to ignore numeric QTypes has been added.
          Thanks to Mirko Buffoni for the patch.
        * GenericJMX plugin: The new, Java-based GenericJMX plugin allows to
          query arbitrary data from a Java process using the “Java Management
          Extensions” (JMX).
        * madwifi plugin: The new MadWifi plugin collects information about
          Atheros wireless LAN chipsets from the MadWifi driver. Thanks to
          Ondrej Zajicek for his patches.
        * network plugin: The receive- and send-buffer-sizes have been made
          configurable, allowing for bigger and smaller packets. Thanks to
          Aman Gupta for the patch.
        * olsrd plugin: The new OLSRd plugin queries routing information from
          the “Optimized Link State Routing” daemon.
        * rrdtool plugin: A new configuration option allows to define a random
          write delay when writing RRD files. This spreads the load created by
          writing RRD files more evenly. Thanks to Mariusz Gronczewski for the
          patch.
        * swap plugin: The possibility to collect swapped in/out pages has
          been added to the Swap plugin. Thanks to Stefan Völkel for the
          patch.
        * tokyotyrant plugin: The new TokyoTyrant plugin reads the number of
          records and file size from a running Tokyo Tyrant server. Thanks to
          Paul Sadauskas for the patch.
        * unixsock plugin: Add the “GETTHRESHOLD” command. This command can be
          used to query the thresholds configured for a particular identifier.
        * write_http plugin: The new Write HTTP plugin sends the values
          collected by collectd to a web-server using HTTP POST requests.
          Thanks to Paul Sadauskas for the patch.
        * zfs_arc plugin: The new ZFS ARC plugin collects information about
          the “Adaptive Replacement Cache” (ARC) of the “Zeta File-System”
          (ZFS). Thanks to Anthony Dewhurst for the patch.
        * empty_counter match: The new Empty Counter match matches value
          lists, where at least one data source is of type COUNTER and the
          counter value of all counter data sources is zero.

2009-12-18, Version 4.7.5
        * Build system, java plugin: Don't use “find -L” to search for Java
          headers, because it's a GNU extension.
        * Build system: Support for parallel builds has been improved. Thanks
          Sebastian Harl and Stefan Völkel for looking into this.
        * collectd: Print error messages to STDERR if no log plugin has been
          loaded.
        * memory plugin: Handling of >4 Gbyte of memory has been fixed.
        * network plugin: The license has been changed to LGPL 2.1.
        * oracle plugin: Reconnect to the database if the connection dies.
        * rrdcached plugin: Work-around for a bug in RRDtool 1.4rc2 has been
          added.
        * snmp plugin: Handling of negative values has been fixed. Strings
          containing control characters are now interpreted as hex-strings.
        * unixsock plugin: A memory leak in the LISTVAL command has been
          fixed. Thanks to Ben Knight for his patch.

2009-10-03, Version 4.7.4
        * Build system: Issues when building the iptables plugin have been
          fixed.
        * exec plugin: Clear the signal block mask before calling exec(2).
        * perl plugin: Declare the “environ” variable. This solves build
          issues on some platforms.
        * processes plugin: Remove unnecessary call of realloc(3). Thanks to
          Andrés J. Díaz for the patch.
        * unixsock plugin: Fix a (well hidden) race condition related to file
          descriptor handling.

2009-09-13, Version 4.7.3
        * collectd: Fix a possible but very rare invalid “free” in the caching
          code. Thanks to Sebastian Harl for the patch.
        * collectd: Remove old values when a cache entry is marked as missing.
          This way the “GETVAL” command of the UnixSock plugin doesn't return
          old, no longer valid values when this happens. Thanks to Andrés J.
          Díaz for the patch.
        * collectd: The “plugin_unregister_read” function has been fixed.
        * apache, ascent, bind, curl, nginx plugins: Advise the cURL library
          to follow redirects. Thanks to Joey Hess for reporting this bug.
        * df plugin: Check the ignorelist before stating the file system,
          possibly reducing the number of stats considerably. Thanks to Joey
          Hess for reporting this bug.
        * iptables plugin: Support for the new libiptc API has been added.
          Thanks to Sebastian Harl for the patch. The build system has been
          updated to the plugin only includes the shipped header files when it
          is linked with the shipped library, too.
        * java plugin: Delay creating the JVM until after the daemon has
          forked. The JVM internally creates threads that are lost when
          forking. This means that Java-based plugins are now configured
          during the init-phase, i. e. later than other plugins.
        * libvirt plugin: Re-connect to libvirtd if connecting fails. Thanks
          to Alan Pevec for the patch.
        * network plugin: Fix the handling of the “CacheFlush” option: The
          value was assigned to a wrong variable. The initialization of the
          gcrypt library, which is used for signing / encrypting traffic, has
          been fixed. Thanks to Luke Heberling for the patch.
        * powerdns plugin: Set a timeout when reading data from the datagram
          socket. Handling of the “LocalSocket” option has been fixed.  An
          incorrectly used “type” has been corrected. Thanks to Luke Heberling
          for his patches.

2009-07-19, Version 4.7.2
        * Build system: Support for `DESTDIR' has been fixed in the Java
          bindings.
        * collectd: Okay-notifications have been fixed. Thanks to Andrés J.
          Díaz for fixing this bug.
        * collectd: A programming error has been fixed in the notification
          code. The bug may result in an assertion failure.
        * memcached plugin: Portability fix for Solaris. Thanks to Amit Gupta
          for reporting the bug.
        * ping plugin: Link the plugin with libm.

2009-06-02, Version 4.7.1
        * Build system: Detection of Java has been improved and missing
          details have been added to the configuration summary. Support for
          libtool 2.2 has been added.
        * collectd: Two bugs with the threshold checking have been fixed. The
          first one prevented thresholds to be checked at all, the second one
          caused wrong behavior with the persistency option. Thanks to Andrés
          J. Díaz for fixing these problems.
        * collectd: Handling of the `Include' configuration option has been
          fixed.
        * rrdtool plugin: Make sure initialization is run only once. This
          resolves problems under Solaris and potentially other systems.
          Thanks to Amit Gupta for reporting this bug.
        * java plugin: Make it possible to use dots ('.') instead of slashes
          ('/') as the class separator. Thanks to Randy Rizun for pointing
          this out.
        * swap plugin: A work-around for 32-bit Solaris has been added. Thanks
          to Doug MacEachern for the patch.

2009-05-11, Version 4.7.0
        * apache plugin: Support to query multiple servers has been added.
          Thanks to Amit Gupta for the patch.
        * apache plugin: Handling of lighttpd's scoreboard statistics has been
          improved. Thanks to Amit Gupta for the patch.
        * conntrack plugin: The new conntrack plugin collects the connection
          tracking table size. Thanks to Tomasz Pala for the patch.
        * fscache plugin: The new fscache plugin collects statistics about
          Linux' file-system based caching framework. Thanks to Edward
          Konetzko for the patch.
        * gmond plugin: The new gmond plugin can receive and interpret
          multicast traffic from Ganglia's gmond daemon.
        * java plugin: The new java plugin exports the collectd API to Java,
          making it possible to write extensions to collectd in Java.
        * memcachec plugin: The new memcachec plugin queries data from a
          memcached daemon and parses it similar to the cURL plugin. Thanks to
          Doug MacEachern for the initial code.
        * memcached plugin: Support for connections over UNIX domain sockets
          has been added. Thanks to Franck Lombardi for the patch.
        * memory plugin: Support for OpenBSD and possibly other *BSDs has been
          added. Thanks to Simon Kuhnle for the patch.
        * mysql plugin: Support to query multiple databases has been added.
          Thanks to Doug MacEachern for the patch.
        * mysql plugin: Master/slave statistics have been added.
        * mysql plugin: Lock statistics have been added. Thanks to Rodolphe
          Quiédeville for the patch.
        * network plugin: The possibility to sign or encrypt network traffic
          has been added.
        * protocols plugin: The new protocols plugin provides information
          about network protocols, such as IP, TCP and UDP.
        * snmp plugin: The intervals given in the configuration of the SNMP
          plugin must no longer be a multiple of the global interval.
        * table plugin: The new Table plugin provides parsing for table-like
          structured files, such as many files beneath /proc.
        * ted plugin: The new TED plugin reads power consumption measurements
          from “The Energy Detective” (TED). Thanks to Eric Reed for this
          plugin.
        * onewire plugin: The new `Interval' option allows collecting
          information from OneWire sensors at arbitrary intervals.
        * ping plugin: Support for collecting the drop rate and standard
          deviation of round-trip times has been added.
        * uptime plugin: The new uptime plugin can collect the server's
          uptime. Thanks to Marco Chiappero for the patch.

2009-09-10, Version 4.6.5
        * collectd: Remove old values when a cache entry is marked as missing.
          This way the “GETVAL” command of the UnixSock plugin doesn't return
          old, no longer valid values when this happens. Thanks to Andrés J.
          Díaz for the patch.
        * apache, ascent, bind, curl, nginx plugins: Advise the cURL library
          to follow redirects. Thanks to Joey Hess for reporting this bug.
        * df plugin: Check the ignorelist before stating the file system,
          possibly reducing the number of stats considerably. Thanks to Joey
          Hess for reporting this bug.
        * iptables plugin: Support for the new libiptc API has been added.
          Thanks to Sebastian Harl for the patch. The build system has been
          updated to the plugin only includes the shipped header files when it
          is linked with the shipped library, too.
        * libvirt plugin: Re-connect to libvirtd if connecting fails. Thanks
          to Alan Pevec for the patch.
        * powerdns plugin: Set a timeout when reading data from the datagram
          socket. Handling of the “LocalSocket” option has been fixed.  An
          incorrectly used “type” has been corrected. Thanks to Luke Heberling
          for his patches.

2009-07-18, Version 4.6.4
        * collectd: Okay-notifications have been fixed. Thanks to Andrés J.
          Díaz for fixing this bug.
        * collectd: A programming error has been fixed in the notification
          code. The bug may result in an assertion failure.
        * memcached plugin: Portability fix for Solaris. Thanks to Amit Gupta
          for reporting the bug.

2009-06-02, Version 4.6.3
        * Build system, various plugins: Many build fixes for FreeBSD,
          OpenBSD, NetBSD, Solaris and Mac OS X. Big thanks to Doug MacEachern
          for many fixes and providing a build system for many platforms,
          Ulf Zimmermann for providing a FreeBSD system and Simon Kuhnle for
          providing an OpenBSD system.
        * collectd: Two bugs with the threshold checking have been fixed. The
          first one prevented thresholds to be checked at all, the second one
          caused wrong behavior with the persistency option. Thanks to Andrés
          J. Díaz for fixing these problems.
        * collectd: Handling of the `Include' configuration option has been
          fixed.
        * battery plugin: Don't complain about a missing directory every
          interval.
        * exec plugin: Allow executed programs to close STDERR. Thanks to
          Thorsten von Eicken for reporting this problem.
        * irq plugin: Fix handling of overflowing 32-bit counters. Thanks to
          Tomasz Pala for the patch.
        * perl plugin: Portability build-fixes. Thanks to Doug MacEachern for
          the patch.
        * memory plugin: Fix a potential problem under Solaris.
        * swap plugin: A work-around for 32-bit Solaris has been added. Thanks
          to Doug MacEachern for the patch.

2009-03-18, Version 4.6.2
        * collectd: Some Solaris utility code has been improved.
        * filter subsystem: Allow `Chains' without default targets.
        * liboping: A patch to comply with strict aliasing rules has been
          added.
        * timediff match: Fix a typo: The match was registered with a wrong
          name which prevented this match to be used as documented. Thanks to
          Bruno Prémont for finding this problem.
        * bind plugin: Fix collection of the cached RR sets. The number of RR
          sets currently in the cache was collected as a counter value, which
          is nonsense. Thanks to Bruno Prémont for implementing this.
        * dns plugin: Don't pass NULL to `pcap_open_live': Some systems,
          primarily BSDs, don't take it well and crash.
        * oracle plugin: Portability to 64 bit systems has been improved.
        * postgresql plugin: The default configuration has been improved.
        * rrdtool plugin: Fix a possible race condition: If the network plugin
          is brought and dispatches a value before the rrdtool plugin is
          initialized, the daemon may crash.

2009-02-22, Version 4.6.1
        * collectd: Many documentation fixes.
        * Collectd::Unixsock: Error handling has been improved.
        * regex match: Don't link with the PCRE library.
        * bind plugin: Various bugs have been fixed. Thanks to Bruno Prémont
          for finding and fixing most of them.
        * ipmi plugin: Fix an off-by-one error which could cause segmentation
          faults. Thanks to Peter Holik for his patch.

2009-02-16, Version 4.6.0
        * collectd: Added the `filter chain' infrastructure, which allows the
          user to use `matches' and `targets' to control value processing.
        * collectd: The new `-T' command line argument allows more in-depth
          testing of a configuration. Thanks to Doug MacEachern for the patch.
        * collectd-nagios: The Nagios integration command has been updated to
          use libcollectdclient. The `percentage' aggregation function has
          been added. Thanks to Fabian Linzberger for the patch.
        * libcollectdclient: A library which abstracts communication with the
          unixsock plugin for clients has been added.
        * regex match: Match values by their identifies using regular
          expressions.
        * timediff match: Match for values with an invalid timestamp.
        * value match: Select values by their data sources' values.
        * notification target: Create and dispatch a notification.
        * replace target: Replace parts of an identifier using regular
          expressions.
        * set target: Set (overwrite) entire parts of an identifier.
        * bind plugin: This new plugin uses the new HTTP/XML interface to BIND
          statistics, allowing very detailed name server statistics. Thanks to
          Bruno Prémont for this plugin.
        * cpu plugin: Report `interrupt' separately when using
          sysctlbyname(3) (used under *BSD). Support for sysctl(3), for
          example for native OpenBSD support, has been added. Thanks to Simon
          Kuhnle for the patch.
        * csv plugin: Make it possible to write values to STDOUT instead of
          files. This is meant for testing purposes mostly. The output written
          to STDOUT is compatible with the exec plugin. Thanks to Doug
          MacEachern for the patch.
        * curl plugin: This new plugin can be used to read web pages and parse
          them using the same mechanism that's used in the tail plugin.
        * dbi plugin: This new plugin allows you to connect to a variety of
          relational databases and use SQL to gather custom statistics from
          it. It is similar to the already existing PostgreSQL plugin but uses
          libdbi to communicate with the database(s).
        * interface plugin: Use the ignorelist framework when selecting /
          ignoring interfaces. This allows one to use regular expressions to
          select interfaces, too.
        * ipmi plugin: Handle temporary IPMI error conditions more gracefully.
          Thanks to Bruno Prémont for this patch.
        * memcached plugin: Add hit-ratio metric. Thanks to Doug MacEachern
          for the patch.
        * mysql plugin: Allow connecting to a database via the UNIX domain
          socket, too. Thanks to Mirko Buffoni for the patch.
        * network plugin: Further performance improvements for the receive
          code. This hopefully will help very large setups.
        * openvpn plugin: This new plugin collects statistics provided by the
          OpenVPN daemon. Thanks to Doug MacEachern for the patch.
        * oracle plugin: This new plugin allows you to connect to an Oracle
          database and use SQL to gather custom statistics from it. It is
          similar to the already existing PostgreSQL plugin.
        * perl plugin: Compatibility fixes for broken versions of Perl 5.10
          have been added.
        * perl plugin: Export the newly added plugin_write() to Perl plugins.
        * perl plugin: Added support for `notification meta data'.
        * perl plugin: Added support for the `filter chain' infrastructure by
          allowing plugins to register `matches' and `targets'.
        * postgresql plugin: The preferred configuration syntax has been
          updated to be in line with the syntax used by the new dbi and oracle
          plugins. The compatibility code for the old syntax is present.
          Support for the new `Result' blocks and the interval parameter has
          been added.
        * processes plugin: Stacksize and virtual memory usage statistics have
          been added. Portability fixes.
        * rrdcached plugin: This new plugin uses the (still in development)
          RRD accelerator daemon, rrdcached. This daemon works very similar to
          the original rrdtool plugin of collectd, but adds some more nice
          features.
        * swap plugin: Code for OpenBSD (and possibly other *BSDs) has been
          added.

2009-05-09, Version 4.5.4
        * Build system, various plugins: Many build fixes for FreeBSD,
          OpenBSD, NetBSD, Solaris and Mac OS X. Big thanks to Doug MacEachern
          for many fixes and providing a build system for many platforms,
          Ulf Zimmermann for providing a FreeBSD system and Simon Kuhnle for
          providing an OpenBSD system.
        * collectd: Fix a potential race condition when creating directories.
        * battery plugin: Don't complain about a missing directory every
          interval.
        * dns plugin: Slight portability fixes.
        * exec plugin: Allow executed programs to close STDERR. Thanks to
          Thorsten von Eicken for reporting this problem.
        * irq plugin: Fix handling of overflowing 32-bit counters. Thanks to
          Tomasz Pala for the patch.
        * perl plugin: Portability build-fixes. Thanks to Doug MacEachern for
          the patch.
        * rrdtool plugin: Fix a possible race condition: If the network plugin
          is initialized and dispatches a value before the rrdtool plugin is
          initialized, the daemon may crash.
        * memory plugin: Fix a potential problem under Solaris.

2009-02-22, Version 4.5.3
        * build system: The check for libupsclient even when `pkg-config' is
          not available.
        * collectd: Fix error handling in the global cache.
        * Collectd::Unixsock: Error handling has been improved.
        * ascent plugin: Fix a memory leak. Thanks to Bruno Prémont for his
          patch.
        * ipmi plugin: Fix an off-by-one error which could cause segmentation
          faults. Thanks to Peter Holik for his patch.
        * tcpconns plugin: An endianness problem has been fixed in the *BSD
          code. Thanks to "thated" for reporting this.

2009-01-02, Version 4.5.2
        * build system: Check for `mysql.h' and `mysql/mysql.h', since the
          file may be in both locations, especially when the database was
          installed in a non-standard path. Thanks to Dusty Doris for
          reporting this.
        * build system: Handle the _POSIX_PTHREAD_SEMANTICS defined, needed by
          Solaris, in the configure script automatically.
        * build system, tcpconns plugin: Check for `kvm_nlist' and
          `kvm_openfiles' before enabling the plugin: Solaris provides a KVM
          library with similar functions to the BSD variant, but doesn't
          provide these necessary functions.
        * collectd.conf(5): Various fixes and clarifications.
        * collectd: Remove a GNUism (unnamed unions), thus improving
          portability.
        * collectd, apcups plugin: Include "collectd.h" before <stdlib.h>.
          This solves portability problems, especially for Solaris.
        * dns plugin: Fix a portability problem with NetBSD.
        * filecount plugin: Fix an off-by-one error. This error may cause a
          segmentation fault.
        * network plugin: Fix the handling of `type' in the network protocol.
          Due to a programming mistake, only 4 or 8 bytes would be copied to a
          much larger buffer. This caused the `type' to be transferred much
          more often than necessary. In some cases, e. g. the `cpu' and
          `cpufreq' plugins being used at the same time, data may be corrupted
          in those files. Thanks to Bruno Prémont for debugging and reporting
          this issue.
        * processes plugin: Fix a possible segmentation fault when specifying
          invalid configuration options.
        * unixsock plugin: Make sure the initialization function is run only
          once. This resolves a file descriptor leak under systems which run
          the initialization more than once, such as Solaris.

2008-10-16, Version 4.5.1
        * build system: Change `--enable-<plugin>' to abort with an error if
          dependencies are not met. Thanks to Bruno Prémont for the patch.
          Also, the poisoning of various string functions has been restricted
          to debug builds.
        * collectd: Fix a memory leak in the global value cache. With every
          *missing* value a couple of bytes would be leaked. Another memory
          leak in the configuration handling code has been fixed. Thanks to
          Niraj Tolia for reporting these issues.
        * collectd: Fix an off-by-one error in the ignorelist functionality.
          When using regular expressions, the last character would be missing,
          possibly matching differently from what one would expect.
        * collectdmon: Don't block SIGCHLD. This fixes a potential portability
          problem.
        * collectd-nagios: Fix handling of the `-d' option. Thanks to Fabian
          Linzberger for reporting the bug.
        * iptables plugin: Fix an off-by-one error. If a string was just one
          character too long, it was truncated instead of reporting an error.
        * network plugin: Fix a memory leak in the configuration handling
          code. Thanks to Niraj Tolia for reporting this issue.
        * perl plugin: Log an error message if bootstrapping `Collectd' fails.
        * postgresql plugin: Don't reopen connection during reinitialization.
          This fixes a bug under Solaris and potentially other platforms.
          Missing calls to `PQclear' have been added, too. This fixes memory
          leaks. Thanks to ``Admin'' for reporting these bugs.
        * snmp plugin: Don't expect null-terminated strings from the Net-SNMP
          library.
        * tail plugin: Call `clearerr(3)' after reading an EOF. This fixes
          problems with some `libc's. Thanks to Matthias Lay for reporting the
          bug.

2008-09-04, Version 4.5.0
        * collectd: Added the ability to flush certain identifiers.
        * collectd: The concept of `notification meta data' has been
          introduced.
        * filecount plugin: The new filecount plugin counts the number of
          files in a directory and its subdirectories.
        * ipmi plugin: Sensor names have been changed to ensure unique names.
          Notifications upon added and removed sensors can now be generated.
        * notify_desktop plugin: This new plugin sends notifications to the
          X desktop using the structure defined in the `Desktop Notification
          Specification'.
        * notify_email plugin: This new plugin sends out notifications via
          email, using the `esmtp' library.
        * onewire plugin: The new experimental(!) onewire plugin reads values,
          such as temperatures, from sensors connected to the computer via the
          onewire bus.
        * perl plugin: Improved synchronized access to internal data structures
          and fixed a possible dead-lock.
        * perl plugin: Added the ability to flush certain identifiers and marked
          plugin_flush_all() and plugin_flush_one() as deprecated in favor of
          plugin_flush().
        * perl plugin: Added the ability to configure Perl plugins.
        * postgresql plugin: The new postgresql plugin collects statistics
          about or from a PostgreSQL database.
        * processes plugin: The `ProcessMatch' option has been added.
        * rrdtool plugin: Implement throttling of the `update queue' to lessen
          IO load.
        * tcpconns plugin: This plugin has been ported to OpenBSD.
        * thermal plugin: The new thermal plugin collects system temperatures
          using Linux ACPI thermal zone data.

2009-01-02, Version 4.4.5
        * build system: Check for `mysql.h' and `mysql/mysql.h', since the
          file may be in both locations, especially when the database was
          installed in a non-standard path. Thanks to Dusty Doris for
          reporting this.
        * build system: Handle the _POSIX_PTHREAD_SEMANTICS defined, needed by
          Solaris, in the configure script automatically.
        * collectd.conf(5): Various fixes and clarifications.
        * apcups plugin: Include "collectd.h" before <stdlib.h>. This solves
          portability problems, especially for Solaris.
        * dns plugin: Fix a portability problem with NetBSD.
        * network plugin: Fix the handling of `type' in the network protocol.
          Due to a programming mistake, only 4 or 8 bytes would be copied to a
          much larger buffer. This caused the `type' to be transferred much
          more often than necessary. In some cases, e. g. the `cpu' and
          `cpufreq' plugins being used at the same time, data may be corrupted
          in those files. Thanks to Bruno Prémont for debugging and reporting
          this issue.
        * unixsock plugin: Make sure the initialization function is run only
          once. This resolves a file descriptor leak under systems which run
          the initialization more than once, such as Solaris.

2008-10-16, Version 4.4.4
        * build system: Change `--enable-<plugin>' to abort with an error if
          dependencies are not met. Thanks to Bruno Prémont for the patch.
          Also, the poisoning of various string functions has been restricted
          to debug builds.
        * collectd: Fix a memory leak in the global value cache. With every
          *missing* value a couple of bytes would be leaked. Another memory
          leak in the configuration handling code has been fixed. Thanks to
          Niraj Tolia for reporting these issues.
        * collectd: Fix an off-by-one error in the ignorelist functionality.
          When using regular expressions, the last character would be missing,
          possibly matching differently from what one would expect.
        * collectdmon: Don't block SIGCHLD. This fixes a potential portability
          problem.
        * collectd-nagios: Fix handling of the `-d' option. Thanks to Fabian
          Linzberger for reporting the bug.
        * network plugin: Fix a memory leak in the configuration handling
          code. Thanks to Niraj Tolia for reporting this issue.
        * perl plugin: Log an error message if bootstrapping `Collectd' fails.
        * tail plugin: Call `clearerr(3)' after reading an EOF. This fixes
          problems with some `libc's. Thanks to Matthias Lay for reporting the
          bug.

2008-09-01, Version 4.4.3
        * collectd: Fix a memory leak in the threshold checking code.
        * memcached plugin: Fix a too short timeout and a related file
          descriptor leak.
        * memory plugin: A typo in the libstatgrab code has been fixed.
        * snmp plugin: Fix a possible memory leak.

2008-07-15, Version 4.4.2
        * build system: Use pkg-config to detect the upsclient library.
        * collectd: Try even harder to determine the endianness of the
          architecture collectd is being built on.
        * disk plugin: Fix for Linux 2.4: A wrong field was used as the name
          of disks.
        * dns plugin: Fix compilation errors with BIND versions 19991001
          through 19991005.
        * network plugin: Bugfix in the init routine: The init function
          cleared a buffer regardless of its contents. This could lead to lost
          values under Solaris.
        * nginx plugin: Remove usage of the thread-unsafe `strtok' function.
        * vserver plugin: Remove usage of the thread-unsafe `readdir'
          function.
        * wireless plugin: Work around incorrect noise and power values
          returned by some broken drivers.

2008-06-03, Version 4.4.1
        * collectd: Fix the `DataSource' option within `Type' blocks. Thanks
          to kyrone for reporting this.
        * collectd: Fixed min/max output in notifications generated by
          threshold checking.
        * collectd-nagios: Fix the protocol used to communicate with the
          daemon.
        * perl plugin: Fail noisily, but don't shutdown the daemon, if
          initialization has errors. An issue with Perl 5.10 has been fixed.
        * teamspeak2 plugin: Fixed an out of bound array access. Thanks to
          René Rebe and Siegmund Gorr for reporting this.

2008-05-06, Version 4.4.0
        * collectd: Internal code cleanups.
        * collectd: Added support for a `Flush' command in the unixsock and
          exec plugins. This command can be used to force a plugin (or all) to
          flush its values to disk.
        * collectd: Thresholds can now be configured to apply to one data
          source only, making it possible to configure different thresholds
          for each data source.
        * apache, nginx plugins: Added the possibility to disable host and/or
          peer verification.
        * ascent plugin: The new ascent plugin reads and parses the statistics
          page of an Ascent server.
        * cpu plugin: Support for the statgrab library has been added.
        * disk plugin: The possibility to ignore certain disks or collect only
          specific disks has been added.
        * disk plugin: Support for the statgrab library has been added.
        * ipmi plugin: The new ipmi plugin uses the OpenIPMI library to read
          sensor values via IPMI, the intelligent platform management
          interface.
        * iptables plugin: The iptc library that is used by the iptables
          plugin has been added to the distribution, because it is not
          provided by all distributions and removed from at least one.
        * powerdns plugin: The new powerdns plugin reads statistics from an
          authoritative or a recursing PowerDNS name server.
        * rrdtool plugin: The size of the files generated with the default
          configuration has been decreased.
        * tail plugin: The new tail plugin can be used to gather statistics by
          continuously reading from log files.
        * teamspeak2 plugin: The new teamspeak2 plugin connects to a
          TeamSpeak2 server and collects statistics about the number of users
          and number of channels.
        * users plugin: Support for the statgrab library has been added.
        * vmem plugin: The new vmem plugin collects very detailed statistics
          about the virtual memory subsystem of Linux.

2008-08-30, Version 4.3.4
        * Build system: Improved detection of and linking with the statgrab
          library.
        * collectd: Portability fixes, especially to determine endianness more
          reliable.
        * Various plugins: Fix format strings.
        * disk plugin: A fix for giving disks under Linux 2.4 the right names
          again has been applied.
        * memcached plugin: Fix a too short timeout and a related file
          descriptor leak.
        * memory plugin: A typo in the libstatgrab code has been fixed.
        * network plugin: A fix in the initialization function solves problems
          under Solaris.
        * nginx plugin: A thread-unsafe function has been replaced.
        * vserver plugin: A thread-unsafe function has been replaced.
        * wireless plugin: A work-around for broken wireless drivers has been
          added.

2008-04-22, Version 4.3.3
        * build system: Improved detection of several libraries, especially if
          they are in non-standard paths.
        * build system: Portability fixes: Automatically define "_REENTRANT"
          if the libc expects it.
        * collectd: Error and warning messages have been improved.
        * collectd: Check for the BYTE_ORDER and BIG_ENDIAN defines before
          using them.
        * apache plugin: Allocate new memory when reading a webpage instead of
          using a buffer of static size.
        * exec plugin: Close (almost) all filedescriptors before exec(2)ing
          the program.
        * hddtemp plugin: Error and warning messages have been improved.
        * sensors plugin: Fix sensor collection for some chip types.

2008-03-29, Version 4.3.2
        * collectd: Fix configuration of the `FailureMax', `WarningMax', and
          `Persist' threshold options.
        * collectd: Fix handling of missing values in the global value cache.
        * collectd: Improved error messages when parsing the configuration.
        * sensors plugin: Fix temperature collection with libsensors4.
        * unixsock plugin: Fix mixed input and output operation on streams.
        * wireless plugin: Fix reading noise value.

2008-03-05, Version 4.3.1
        * exec plugin: Set supplementary group IDs.
        * network plugin:
          + Use `memcpy' when constructing/parsing a package to avoid
            alignment problems on weird architectures, such as Sparc.
          + Translate doubles to/from the x86 byte representation to ensure
            cross-platform compatibility.
        * ping plugin: Correct the handling of the `TTL' setting.
        * swap plugin: Reapply a patch for Solaris.
        * tcpconns plugin: Portability improvements.

2008-02-18, Version 4.3.0
        * collectd: Notifications have been added to the daemon. Notifications
          are status messages that may be associated with a data instance.
        * collectd: Threshold checking has been added to the daemon. This
          means that you can configure threshold values for each data
          instance. If this threshold is exceeded a notification will be
          created.
        * collectd: The new `FQDNLookup' option tells the daemon to use the
          full qualified domain name as the hostname, not just the host part
          es returned by `gethostname(2)'.
        * collectd: Support for more than one `TypesDB' file has been added.
          This is useful when one such file is included in a package but one
          wants to add custom type definitions.
        * collectd: The `Include' config option has been expanded to handle
          entire directories and shell wildcards.
        * collectdmon: The new `collectdmon' binary detects when collectd
          terminates and automatically restarts it again.
        * csv plugin: The CSV plugin is now able to store counter values as a
          rate, using the `StoreRates' configuration option.
        * exec plugin: Handling of notifications has been added and the
          ability to pass arguments to the executed programs has been added.
        * hddtemp plugin: The new `TranslateDevicename' option lets you
          disable the translation from device names to major-minor-numbers.
        * logfile plugin: Handling of notifications has been added.
        * ntpd plugin: The new `ReverseLookups' can be used to disable reverse
          domain name lookups in this plugin.
        * perl plugin: Many internal changes added support for handling multiple
          threads making the plugin reasonably usable inside collectd. The API has
          been extended to support notifications and export global variables to
          Perl plugins; callbacks now have to be identified by name rather than a
          pointer to a subroutine. The plugin is no longer experimental.
        * uuid plugin: The new UUID plugin sets the hostname to an unique
          identifier for this host. This is meant for setups where each client
          may migrate to another physical host, possibly going through one or
          more name changes in the process. Thanks to Richard Jones from
          Red Hat's Emerging Technology group for this plugin.
        * libvirt: The new libvirt plugin uses the `libvirt' library to query
          CPU, disk and network statistics about guest systems on the same
          physical server. Thanks to Richard Jones from Red Hat's Emerging
          Technology group for this plugin.

2008-04-22, Version 4.2.7
        * build system: Improved detection of several libraries, especially if
          they are in non-standard paths.
        * build system: Portability fixes: Automatically define "_REENTRANT"
          if the libc expects it.
        * collectd: Error and warning messages have been improved.
        * collectd: Check for the BYTE_ORDER and BIG_ENDIAN defines before
          using them.
        * apache plugin: Allocate new memory when reading a webpage instead of
          using a buffer of static size.
        * exec plugin: Close (almost) all filedescriptors before exec(2)ing
          the program.
        * hddtemp plugin: Error and warning messages have been improved.
        * sensors plugin: Fix sensor collection for some chip types.

2008-03-29, Version 4.2.6
        * collectd: Improved error messages when parsing the configuration.
        * sensors plugin: Fix temperature collection with libsensors4.
        * unixsock plugin: Fix mixed input and output operation on streams.
        * wireless plugin: Fix reading noise value.

2008-03-04, Version 4.2.5
        * apache plugin: Improved initialization and error messages.
        * exec plugin: Set supplementary group IDs.
        * network plugin:
          + Create separate threads for reading from the socket and parsing
            and dispatching incoming packets. Versions prior to this may have
            problems in high-load situations, where the socket receive buffers
            overflows, resulting in gaps in the data.
          + Use `memcpy' when constructing/parsing a package to avoid
            alignment problems on weird architectures, such as Sparc.
          + Translate doubles to/from the x86 byte representation to ensure
            cross-platform compatibility.
        * ping plugin: Correct the handling of the `TTL' setting.
        * rrdtool plugin: Ensure correct handling of the `RRATimespan' option.
        * swap plugin: Reapply a patch for Solaris.
        * tcpconns plugin: Portability improvements.

2008-01-21, Version 4.2.4
        * unixsock plugin: A bug in the unixsock plugin caused it not to set
          the permission on the socket as documented in the manpage. Thanks to
          Evgeny Chukreev for fixing this issue.
        * collectd: The documentation has been improved.

2007-12-28, Version 4.2.3
        * sensors plugin: Updated the plugin to build and work with version 3
          of the libsensors library.

2007-12-15, Version 4.2.2
        * nginx plugin: Incorrect comparison of strings lead to a segfault
          when using the plugin. Thanks to Saulius Grigaliunas for fixing
          this.
        * logfile plugin: The config option `Timestamp' was handled
          incorrectly and basically always active. Thanks to Luke Heberling
          for fixing this.

2007-11-08, Version 4.2.1
        * tcpconns plugin: Don't complain about a missing file if IPv6 is not
          enabled on the host.
        * snmp plugin: Fix a memory leak.

2007-10-27, Version 4.2.0
        * collectd: The new config option `Include' lets you include other
          configfiles and thus split up your config into smaller parts. This
          may be especially interesting for the snmp plugin to keep the data
          definitions separate from the host definitions.
        * ipvs plugin: The new `ipvs' plugin collects IPVS connection statistics
          (number of connections, octets and packets for each service and
          destination). Thanks to Sebastian Harl for this plugin.
        * memcached plugin: The new `memcached' plugin connects to a memcached
          daemon process and collects statistics of this distributed caching
          system. Thanks to Antony Dovgal for contributing this plugin.
        * nginx plugin: The new `nginx' plugin reads the status page of an
          nginx daemon and saves the handled connections and requests.
        * perl plugin: Many changes, including the added `EnableDebugger'
          config option which lets you debug your Perl plugins more easily.
        * rrdtool plugin: Use the thread-safe RRD-library if available. Try to
          be more thread-safe otherwise by locking calls to the library.
        * snmp plugin: Added the options `Scale' and `Shift' to Data-blocks to
          correct the values returned by SNMP-agents. If a <data> block is
          defined as `table' the instance is now optional. The sequence number
          is used as the type-instance in this case. The new `InstancePrefix'
          option allows to add arbitrary prefixes to the type-instance.
        * tcpconns plugin: The new `tcpconns' plugin collects the number of
          certain TCP connections and what state they're in. This can be used
          to see how many connections your FTP server has to handle or how
          many outgoing connections your mailserver has open.

2008-01-11, Version 4.1.6
        * unixsock plugin: A bug in the unixsock plugin caused it not to set
          the permission on the socket as documented in the manpage. Thanks to
          Evgeny Chukreev for fixing this issue.
        * collectd: The documentation has been improved.

2007-12-27, Version 4.1.5
        * rrdtool plugin: Fix a memory leak that only occurred in very-low-
          memory situations.
        * sensors plugin: Updated the plugin to build and work with version 3
          of the libsensors library.

2007-11-08, Version 4.1.4
        * Build system: Improve detection of the rrd library, especially if
          it's in a non-standard location.
        * Build system: A bug when parsing the argument for
          `--with-libnetsnmp' has been fixed.
        * collectd: Implement `strerror_r' if the libc doesn't provide it.
        * rrdtool plugin: Fix a bug in the shutdown sequence that might cause
          a deadlock or delay when shutting down the daemon.
        * snmp plugin: Fix a memory leak.

2007-10-24, Version 4.1.3
        * collectd: A build issue under Solaris has been resolved by renaming
          data types.
        * rrdtool plugin: Use the thread-safe RRD-library if available. Try to
          be more thread-safe otherwise by locking calls to the library.

2007-09-28, Version 4.1.2
        * apcups plugin: Fix reporting of the `load percent' data.
        * wireless plugin: Correct the handling of cards returning signal and
          noise quality as percentage.
        * perl plugin: Fix a possible buffer overflow in get_module_name().
        * build system: Further improve the detection of libraries.
        * netlink plugin: Build issues under some older versions of the Linux
          includes (i. e. Debian Sarge) have been fixed.
        * snmp plugin: Fix a potential segfault when a host times out. Add
          support for the `timeticks' type. 

2007-09-12, Version 4.1.1
        * Build system: The detection of `libnetlink' has been improved.
        * collectd: The documentation has been fixed in numerous places.
        * exec plugin: Setting the group under which to run a program has been
          fixed.
        * collectd: The `sstrerror' function was improved to work correctly
          with the broken GNU version of `strerror_r'.
        * collectd: Write an error message to STDERR when loading of a plugin
          fails.
        * apcups plugin: Fix the `types' used to submit the values: They still
          has an `apcups_' prefix which doesn't work anymore.
        * rrdtool plugin: Create new RRD-files with the `begin' time set to
          whatever the client thinks is `now'..

2007-09-01, Version 4.1.0
        * Build system: The build system has been changed to automatically
          disable all plugins, which are missing dependencies. The dependency
          checking has been removed from the plugins themselves to remove
          redundancy.
        * Flexible interval: The interval of collected data is now sent along
          with the data itself over the network, so that the interval-settings
          of server and clients no longer needs to match.
        * netlink plugin: The new `netlink' plugin connects to the Linux
          kernel using a netlink socket and uses it to query information about
          interfaces, qdiscs and classes.
        * rrdtool plugin: The cache is now dumped to disk in an extra thread
          to not block data collection.
        * snmp plugin: The new `snmp' plugin can read values from SNMP enabled
          network devices, such as switches, routers, thermometers, rack
          monitoring servers, etc. The collectd-snmp(5) manpage documents this
          plugin.
        * unixsock plugin: Added the `LISTVAL' command.
        * xmms plugin: The new `xmms' plugin graphs the bitrate and frequency
          of music played with xmms.

2007-09-28, Version 4.0.9
        * apcups plugin: Fix reporting of the `load percent' data.
        * wireless plugin: Correct the handling of cards returning signal and
          noise quality as percentage.
        * perl plugin: Fix a possible buffer overflow in get_module_name().

2007-09-12, Version 4.0.8
        * collectd: The `sstrerror' function was improved to work correctly
          with the broken GNU version of `strerror_r'.
        * collectd: Write an error message to STDERR when loading of a plugin
          fails.
        * apcups plugin: Fix the `types' used to submit the values: They still
          has an `apcups_' prefix which doesn't work anymore.
        * rrdtool plugin: Create new RRD-files with the `begin' time set to
          whatever the client thinks is `now'..

2007-08-26, Version 4.0.7
        * documentation: Some typos have been fixed and some information has
          been improved.
        * build system: Many fixes for detecting libraries in unusual places,
          such as on RedHat systems. The affected libraries are `libcurl',
          `libmysql', and `libupsclient'.
        * network plugin: Allow the `Port' option to be specified as a number
          (i. e. without quotes).
        * nut plugin: A fix allows linking the nut plugin against
          libupsclient, version >= 2.2.0.
        * processes plugin: Fix a potential segmentation fault.

2007-07-30, Version 4.0.6
        * sensors plugin: Fix the ignorelist functionality: Only the `type
          instance' was used to match against the list, but the documentation
          told otherwise. This release fixes the code, so it complies with the
          documentation.
        * syslog plugin: Call `openlog' right when the plugin is loaded, so
          configuration messages will end up in the logging facility.
        * conrtib/fedora: The contributed specfile for Fedora has been
          updated.

2007-07-05, Version 4.0.5
        * Portability: More fixes for OpenBSD have been included.

2007-06-24, Version 4.0.4
        * cpu plugin: Fixed the Solaris code.
        * dns plugin: Fixed a build issue for OpenBSD.
        * interface plugin: Fixed the Solaris code.
        * load plugin: Fixed the alternative `/proc' Linux code.
        * memory plugin: Fixed the Solaris code.
        * oconfig: Don't require `-lfl' anymore.

2007-06-19, Version 4.0.3
        * cpu plugin: Fix the Darwin / Mac OS X code.
        * ping plugin: Use the return value of `getpid', not its address.
        * csv, rrdtool plugin: Fixed a bug that prevented an buffer to be
          initialized correctly.
        * configure: Added `--with-nan-emulation' to aid cross compilation.

2007-06-12, Version 4.0.2
        * hddtemp and ntpd plugin: Corrected the parsing of port numbers when
          they're given in numerically form.

2007-06-07, Version 4.0.1
        * iptables plugin: A bug in the configuration routine has been fixed.
          Setting a comment in the configfile will no longer cause a
          segmentation fault.

2007-06-03, Version 4.0.0
        * collectd: The plugin-infrastructure has been changed to allow for
          more types of plugins, namely `write' and `log' plugins.
        * collectd: The read-function has been changed to read many plugins in
          parallel, using threads. Thus, plugins generally need to use
          thread-safe functions from now on.
        * collectd: The '-t' command line options allows to perform syntax tests
          of the configuration file and exit immediately.
        * csv plugin: The new `csv' plugin handles output to `comma separated
          values'-files.
        * rrdtool plugin: The new `rrdtool' plugin handles output to
          RRD-files. Data can be cached to combine multiple updates into one
          write to increase IO-performance.
        * network plugin: The new `network' plugin handles IO via the network.
          It implements a different, much more extensible protocol which can
          combine many values in one packet, decreasing the number of UDP-
          packets being sent. It can read from and send to the network and
          with the appropriate configuration even forward packets to other
          networks.
        * unixsock plugin: The new `unixsock' plugin provides an interface to
          communicate with the daemon while it is running. Right now the
          commands `GETVAL' and `PUTVAL' are implemented, but more are to
          come.
        * perl plugin: The new `perl' plugin allows you to write extensions
          for collectd in the scripting-language Perl.
        * logfile plugin: The new `logfile' plugin writes logmessages to files
          or STDOUT or STDERR.
        * syslog plugin: The new `syslog' plugin sends logmessages to the
          system's syslog daemon.
        * entropy plugin: The new `entropy' plugin collects the amount of
          entropy currently being available to the system.
        * exec plugin: The new `exec' plugin forks child processes and reads
          back values provided by the forked processes.
        * iptables plugin: The new `iptables' plugin reads counters from
          iptables rules. Thanks to Sjoerd van der Berg for contributing this
          plugin.
        * irq plugin: The new `irq' plugin collects the IRQ-counters. Thanks
          to Peter Holik for contributing this plugin.
        * nut plugin: The new `nut' plugin connects the upsd of the `network
          ups tools' and reads information about the connected UPS.
        * apache plugin: Support for lighttpd's `BusyServers' (aka.
          connections) field was added by Florent Monbillard.
        * collectd-nagios: The new `collectd-nagios' binary queries values
          from collectd, parses them and exits according to Nagios-standards.
        * manpages: The manpages have been improved a lot.

2007-09-28, Version 3.11.7
        * wireless plugin: Correct the handling of cards returning signal and
          noise quality as percentage.

2007-08-31, Version 3.11.6
        * processes plugin: Fix a potential segmentation fault.

2007-05-29, Version 3.11.5
        * configure: Added `AC_SYS_LARGEFILE' for LFS.
        * ntpd plugin: Fix a potential buffer overflow.
        * processes plugin: Fix a bug when run under Linux 2.4. All processes
          were accounted as `zombies'.

2007-04-10, Version 3.11.4
        * dns plugin: Change the order of includes to make the plugin compile
          under FreeBSD.

2007-03-30, Version 3.11.3
        * configure: Have the configure-script define `HAVE_LIBKSTAT' instead
          of the unused `COLLECT_KSTAT'.

2007-02-11, Version 3.11.2
        * plugin: Catch NULL-pointer and try to fix them. Otherwise the
          NULL-pointer may have been passed to `printf' which causes a
          segfault with some libcs.

2007-02-10, Version 3.11.1
        * df plugin: Some wrong defines have been fixed so the plugin works
          under Solaris again.
        * dns plugin: The usage of a struct has been fixed to work with
          non-GNU libcs.
        * processes plugin: Some missing defines have been added so the plugin
          compiles cleanly under FreeBSD and presumably other UNIXes.

2006-12-22, Version 3.11.0
        * collectd: The new command line option `-P' makes it easier for
          distributors to change the location of PID-files.
        * collectd: The daemon shuts down faster now which makes it easier to
          write init.d-scripts for it.
        * apache plugin: Increase the buffersize to 16k, because the 4k buffer
          caused problems every now and then.
        * df plugin: New config options allow to ignore certain mountpoints,
          filesystem types or devices.
        * dns plugin: The new dns plugin uses `libpcap' to capture DNS traffic
          and interprets it. It collects traffic as well as qtype, opcode and
          rcode counts.
        * email plugin: Sebastian Harl has contributed this plugin which
          counts received mails in categories (e. g. ham, spam, virus), spam
          score (as given by SpamAssassin) and check types.
        * mbmon plugin: Flavio Stanchina has contributed this plugin which
          uses `mbmon' to gather information from sensors on the motherboard.
        * processes plugin: Collect detailed statistics for configured
          processes, that's process and thread count, CPU usage, resident
          segment size and pagefaults.
        * multimeter plugin: Peter Holik contributed a new plugin which
          queries multimeters.
        * sensors plugin: Lubos Stanek has put much effort into improving this
          plugin, including `extended naming', collection of voltage values
          and the possibility to ignore certain values.

2006-12-21, Version 3.10.4
        * Max Kellermann has identified a bug in the server routine: When
          opening a socket fails the daemon will (re)try opening the socket in
          an endless loop, ultimately leading to a `EMFILE' error.

2006-11-04, Version 3.10.3
        * Lubos Stanek has identified a bug in the ntpd-plugin: When the
          ntpd's reply was sent in more than one packet, the buffer size was
          calculated incorrectly, resulting in the reading of uninitialized or
          freed memory.

2006-11-01, Version 3.10.2
        * The sample config file has been improved.
        * Errors in the manpages have been corrected.
        * The ping-plugin now adds hosts during initialization, not during
          startup. This speeds up startup when no network connectivity is
          available. Also, the hosts are being added later when the network is
          available.
        * Improved BSD-support for the df-plugin.
        * Fixed syntax errors in the swap-plugin for Mac OS X.
        * Fix a wrong structure being passed to `getnameinfo' in the ntpd-
          plugin.
        * Don't disable the mysql-plugin if connecting to the database fails
          during initialization. Instead, try again in increasing intervals.

2006-07-19, Version 3.10.1
        * A bug in the apcups plugin was fixed: Is the plugin is loaded, but
          the apcups cannot be reached, unconnected sockets will pile up and
          eventually lead to `Too many open files' errors.

2006-07-09, Version 3.10.0
        * The `disk' plugin has been ported to Darwin.
        * The `battery' plugin should work on many Apple computers now.
        * The `traffic' plugin can now ignore certain interfaces. Also,
          statistics for sent/received packets and errors have been added.
        * A plugin to monitor APC UPSes using `apcupsd' has been added. Thanks
          to Anthony Gialluca for contributing this plugin and providing me
          with a test environment :)
        * A plugin for monitoring an NTP instance and the local clock drift
          has been added.

2006-06-25, Version 3.9.4
        * The Solaris code in the `swap' plugin has been changed to reflect
          the numbers returned by `swap -s'. Thanks to Christophe Kalt for
          working this out.
        * The debugging system has been fixed to work with the Sun libc.
        * When built without librrd the variable `operating_mode' could be
          uninitialized. Thanks to David Elliot for reporting the bug.

2006-06-01, Version 3.9.3
        * Fixed the ping-plugin under FreeBSD and Mac OS X. Potentially other
          operating systems also profit from the changes, but I wasn't able to
          check that.
        * Changed the build system to find the netinet-includes under FreeBSD
          and therefore successfully build the `liboping' library there.

2006-05-09, Version 3.9.2
        * Applied a patch to the `liboping' library. Due to a bug in the
          sequence checking the `ping' plugin stopped working after
          approximately 7.6 days.

2006-05-09, Version 3.8.5
        * Applied a patch to the `liboping' library. Due to a bug in the
          sequence checking the `ping' plugin stopped working after
          approximately 7.6 days.

2006-04-21, Version 3.9.1
        * Build issues with Solaris and possible other architectures have been
          resolved.
        * Problems when building the `apache'-plugin without `libcurl' have
          been resolved.
        * A bug in the `ping' plugin has been fixed. Sorry folks.

2006-04-02, Version 3.9.0
        * A plugin to monitor the Apache webserver has been added.
          <http://httpd.apache.org/>
        * A plugin to collect statistics about virtual servers using VServer.
          <http://linux-vserver.org/> Thanks to Sebastian Harl for writing
          this plugin :)
        * A plugin for wireless LAN cards has been added. It monitors signal
          strength, link quality and noise ratio..
        * A plugin for Apple hardware sensors has been added.
        * An option to compile collectd with different `step' and `heartbeat'
          settings has been added. The size of RRAs is no longer static but
          calculated based on the settings for `step' and `width'.
        * The `ping' plugin can now be configured to use a certain TTL.
        * A plugin to monitor the hardware sensors of Apple computers has been
          added.
        * The plugins `cpu', `memory', `processes' and `traffic' have been
          ported to Mach/Darwin (Mac OS X).
        * The `log mode' has been contributed by Christophe Kalt. It writes
          the data into text files rather than RRD files.

2006-04-09, Version 3.8.4
        * Applied patch by Vincent Stehlé which improves the disk-name
          resolution in the `hddtemp' plugin for Linux systems.

2006-04-02, Version 3.8.3
        * Applied a patch by James Byers: The MySQL plugin was not working
          with MySQL 5.0.2 or later.

2006-03-14, Version 3.8.2
        * `utils_mount.c' has been changed to not use the `MNTTAB' defined by
          the GNU libc, because it points to `/etc/fstab' rather than
          `/etc/mtab'.

2006-03-13, Version 3.8.1
        * Fixes for building collectd under FreeBSD, Mac OS X and Solaris.
        * Fixes in the debian `postinst' and `init.d' scripts.

2006-03-09, Version 3.8.0
        * The `ping' plugin no longer uses `libping' but a self written
          library named `liboping'. With this library it's possible to ping
          multiple IPv4 and IPv6 addresses and hostnames - in parallel.

2006-02-18, Version 3.7.2
        * A simple bug in the `battery' plugin has been fixed. It should now
          work with ACPI based batteries as well. Thanks to Sebastian for
          fixing this.
        * Fixing a bug that prevented collectd to be built without librrd.
          Thanks to Werner Heuser for reporting it.

2006-02-04, Version 3.7.1
        * The new network code has been improved to build with older versions
          of glibc.
        * Fix in `libping' sets the ICMP sequence on outgoing packets. Thanks
          to Tommie Gannert for this patch.

2006-01-30, Version 3.7.0
        * The `battery' plugin has been added. It collects information about
          laptop batteries..
        * The MySQL plugin has been improved: It now writes two more RRD
          files, `mysql_qcache.rrd' and `mysql_threads.rrd'.
        * The `cpufreq' plugin now reads another file since the file it did
          read so far causes much overhead in the kernel. Also, you need root
          to read the old file, but not to read the new one.
        * The `hddtemp' plugin can now be configured to connect to another
          address and/or port than localhost.
        * The `df' plugin now prefers `statvfs' over `statfs'.
        * The network code has been rewritten. collectd now supports unicast
          and multicast, and IPv4 and IPv6. Also, the TTL of sent packages can
          be set in the configfile.

2006-01-24, Version 3.6.2
        * Due to a bug in the configfile handling collectd wouldn't start in
          client mode. This released fixes this.

2006-01-20, Version 3.6.1
        * Due to a bug in `configure.in' all modules and the binary were
          linked against `libmysqlclient'. This issue is solved by this
          release.

2006-01-17, Version 3.6.0
        * A config file has been added. This allows for loading only specific
          plugins.
        * A `df' plugin has been added.
        * A `mysql' plugin has been added.
        * The `ping' plugin doesn't entirely give up hope when a socket error
          occurred, but will back of and increase the intervals between tries.

2006-01-21, Version 3.5.2
        * Fixed yet another bug in the signal handling.. Stupid typo..
        * Improved the ping plugin to not give up on socket errors (backport
          from 3.6.0).

2005-12-18, Version 3.5.1
        * The PID-file is now deleted correctly when shutting down the daemon.
        * SIGINT and SIGTERM are now handled correctly.

2005-12-16, Version 3.5.0 (Revision 326)
        * A bug in the `load' module under Solaris has been fixed.
        * The `users' module has been contributed by Sebastian Harl. It counts
          currently logged in users.
        * The CPU module now works under FreeBSD without the use of
          `libstatgrab', however SMP support is missing.
        * The default directories for the RRD files and the PID file now
          depend on the compile time setting of `localstatedir'.

2005-11-15, Version 3.4.0 (Revision 236)
        * A PID-file is written to /var/run upon startup. Thanks to `Tommie'
          from gentoo's bugzilla for writing the patch.
        * The build dependency for librrd has been removed. Binaries built
          without librrd are client-only and will multicast their value as
          with the `-c' argument.
        * A patch by Peter Holik adds a module for monitoring CPU frequencies.
        * The newly introduced `-f' switch prevents daemon initialization
          (forking, closing standard filehandles, etc.) Thanks to Alvaro
          Barcellos for this patch.

2005-11-04, Version 3.3.0 (Revision 216)
        * New modules have been added:
          - `serial', for monitoring traffic on the serial interfaces
          - `nfs', for graphing NFS procedure calls
          - `tape', traffic from/to tape devices
        * The memory.rrd now accepts more than 4Gig of memory.

2005-10-26, Version 3.2.0 (Revision 200)
        * Support for graphing the processes has been added (thanks to Lyonel
          Vincent)
        * If reading from hddtemp fails collectd will increase the time
          between polls up to one day.
        * The init.d files have been improved.
        * Problems with the spec file have been fixed.

2005-10-16, Version 3.1.0 (Revision 194)
        * Added the `setsid' syscall to the startup code.
        * Support for hddtemp has been added (thanks to Vincent Stehlé)

2005-09-30, Version 3.0.0 (Revision 184)
        * The ability to send/receive data to/from the network (think
          multicast) has been added.
        * Modules have been split up into shared libraries can be loaded at
          runtime. The biggest advantage is that the core program doesn't need
          to be linked against an external library.
        * A patch by George Kargiotakis has been applied: It fixes the sensors
          behaviour then more than one sensor is being queried.

2005-09-16, Version 2.1.0 (Revision 172)
        * A module for swap statistics has been added.

2005-09-09, Version 2.0.0 (Revision 135)
        * Filenames can no longer be configured at program startup. The only
          options as of this version are the directory and ping hosts.
        * CPU statistics now include Wait-IO. If provided under Linux IRQ and
          Soft-IRQ statistics are added to `System'. 
        * Diskstats now collect read and write bytes, not sectors.
        * Ping statistics can now be collected for more than one host. There
          is no default any more: If no host is given no host will be pinged.
        * A self-written patch for libping has been applied so it builds
          cleanly.

2005-09-01, Version 1.8.1 (Revision 123)
        * Much improved configure-script: libraries and features may now be
          disabled.
        * More detailed warnings/error messages when RRD update fails.

2005-08-29, Version 1.8.0:
        * Support for collecting disk statistics under Solaris.

2005-08-25, Version 1.7.0:
        * Support for libstatgrab[1] for load, memory usage and network
          traffic. CPU- and disk-usage are not (yet) supported, since
          libstatgrab returns insufficient information. I will contact the
          authors.
        * Improved the CPU-initialization code for Solaris. Apparently CPUs
          aren't necessarily counted linear which is now handled correctly.
        [1]: http://www.i-scream.org/libstatgrab/

2005-08-21, Version 1.6.0:
        * Basic support for Solaris: System load and cpu-usage can be
          collected under Solaris, too. Other stats will follow later.
        * Many fixes in the autoconf-script
        * Collection/Museum scripts have been added under contrib/museum
        * collectd may now be started in unprivileged mode, though ping
          statistics will not work.

2005-07-17, Version 1.5.1:
        * Diskstats-RRDs now use major/minor for naming. Some systems have
          weird strings as disk-names..

2005-07-17, Version 1.5:
        * A new module, diskstats, has been added. It collects information
          about the disks and partitions.

2005-07-11, Version 1.4.2:
        * The meminfo module has been changed to work with more platforms
          and/or kernel versions.

2005-07-10, Version 1.4.1: Correct traffic stats
        * The traffic rrd-file is now created with DS-type `COUNTER' which I
          forgot to correct when I changed that module.

2005-07-09, Version 1.4: More traffic stats
        * Traffic is now collected for all interfaces that can be found
        * Temperature-statistics are read from lm-sensors if available

2005-07-08, Version 1.3: CPU stats
        * Collecting CPU statistics now

2005-07-12, Version 1.2: Using syslog
        * collectd is now using the syslog facility to report errors, warnings
          and the like..
        * The default directory is now /var/db/collectd

2005-07-10, Version 1.1: Minor changes
        * Nothing really useful to say ;)

2005-07-09, Version 1.0: Initial Version
        * The following modules are provided:
          * Load average
          * Ping time
          * Traffic
          * Memory info