sysdb-0.4.0

Release 0.4.0 of SysDB.

Version 0.4.0, Release Date: 2014-09-01
---------------------------------------

  This release features support for metrics and transparent access to a
  backend's time-series data. Some backward-incompatible changes were applied
  to some query commands for more consistency.

   * build system:
     - Added checks for format strings and arguments.
     - Changed configure option for collectd::unixsock to
       --enable-collectd-unixsock.
   * core:
     - Added support for “metric” objects which may be assigned to a host.
     - Introduced support for handling time-series data: added new data
       structures describing time-series data and a new type of plugins called
       “time-series fetchers” which are used to access time-series
       information.
   * store:
     - Fixed a memory leak.
     - Apply (very) simple optimizations to lookup expressions.
     - Added support for metrics and their “data-stores” (describing how to
       access the actual data references by a metric).
     - Added support for querying time-series data through the newly
       introduced “time-series fetcher” plugins.
   * frontend:
     - Fixed a bug that might have caused reading too much data from the
       connection buffer in certain situations.
   * query language:
     - The ‘MATCHING’ clause is now optional in ‘LOOKUP’ queries.
     - The ‘LIST’ and ‘FETCH’ commands support ‘FILTER’ clauses as well.
     - ‘LIST’ / ‘FETCH’ were changed to ‘LIST hosts’ / ‘FETCH host’.
     - Added the ‘TIMESERIES’ command to query arbitrary time-series which
       fetches time-series data from a backend's data-store for a given period
       of time.
     - Added support for date/time values.
     - Added support for single quotes in string values: two adjacent single
       quotes may be used to specify a single quote.
   * documentation:
     - Documented the frontend protocol in frontend/proto.h.
     - Documented changes to the query language and new / updated plugins.
     - Documented all supported data types.

  Backends:
   * collectd::unixsock:
     - The plugin now uses metrics in place of services.
     - New config options ‘TimeseriesBackend’ and ‘TimeseriesBaseURL’ to
       specify access to time-series, currently limited to ‘rrdtool’ and
       ‘rrdcached’ access.

  Plugins:
   * timeseries::rrdtool:
     - New plugin adding support to fetch time-series from local RRD files.
     - Supports flushing of values in RRDCacheD.
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