write_sensu plugin to write datapoints and notification to sensu client TCP socket...

diff --git a/AUTHORS b/AUTHORS
index 072e7ffe2376165f7510ac513ad93f8431c0c18b..027ac969df303ad6b62e13b174734087d9741374 100644 (file)
--- a/AUTHORS
+++ b/AUTHORS
@@ -106,6 +106,9 @@ Fabian Linzberger <e at lefant.net>
 Fabien Wernli <cpan at faxm0dem.org>
  - Solaris improvements in the memory and interfaces plugin.
 
+Fabrice A. Marie <fabrice at kibinlabs.com>
+ - write_sensu plugin.
+
 Flavio Stanchina <flavio at stanchina.net>
  - mbmon plugin.
 

diff --git a/README b/README
index 9fb900435eeb938180ac7ac90ea71db1d3da2d35..40bb6bc0150f7df78160a36ad1f2ecdaef8becbe 100644 (file)
--- a/README
+++ b/README
@@ -448,6 +448,9 @@ Features
     - write_riemann
       Sends data to Riemann, a stream processing and monitoring system.
 
+    - write_sensu
+      Sends data to Sensu a stream processing and monitoring system, via sensu client local TCP socket.
+
   * Logging is, as everything in collectd, provided by plugins. The following
     plugins keep up informed about what's going on:
 

diff --git a/configure.ac b/configure.ac
index c83805e3b1c46790935cf182b15998c860c9a08b..ad5018ee5e5b8053c08f5b0a76ad7c2e54d4a6c5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -5585,6 +5585,7 @@ AC_PLUGIN([write_log], [yes],                  [Log output plugin])
 AC_PLUGIN([write_mongodb], [$with_libmongoc],  [MongoDB output plugin])
 AC_PLUGIN([write_redis], [$with_libhiredis],    [Redis output plugin])
 AC_PLUGIN([write_riemann], [$have_protoc_c],   [Riemann output plugin])
+AC_PLUGIN([write_sensu], [yes],                [Sensu output plugin])
 AC_PLUGIN([write_tsdb],  [yes],                [TSDB output plugin])
 AC_PLUGIN([xmms],        [$with_libxmms],      [XMMS statistics])
 AC_PLUGIN([zfs_arc],     [$plugin_zfs_arc],    [ZFS ARC statistics])
@@ -5958,6 +5959,7 @@ Configuration:
     write_mongodb . . . . $enable_write_mongodb
     write_redis . . . . . $enable_write_redis
     write_riemann . . . . $enable_write_riemann
+    write_sensu . . . . . $enable_write_sensu
     write_tsdb  . . . . . $enable_write_tsdb
     xmms  . . . . . . . . $enable_xmms
     zfs_arc . . . . . . . $enable_zfs_arc

diff --git a/src/Makefile.am b/src/Makefile.am
index 14708c0110b6a7fdcc0b1a37ee596b14a07a4877..3800ec056b964c09e81c46a0a0dcf217ed1b51ce 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1216,6 +1216,12 @@ write_riemann_la_LDFLAGS = $(PLUGIN_LDFLAGS)
 write_riemann_la_LIBADD = -lprotobuf-c
 endif
 
+if BUILD_PLUGIN_WRITE_SENSU
+pkglib_LTLIBRARIES += write_sensu.la
+write_sensu_la_SOURCES = write_sensu.c
+write_sensu_la_LDFLAGS = $(PLUGIN_LDFLAGS)
+endif
+
 if BUILD_PLUGIN_WRITE_TSDB
 pkglib_LTLIBRARIES += write_tsdb.la
 write_tsdb_la_SOURCES = write_tsdb.c

diff --git a/src/collectd.conf.in b/src/collectd.conf.in
index 8d7622a1ece160af8d5a215006f8285da52a1caf..cd47bd2613798a617a11a57417b9fe9abfbdbaa6 100644 (file)
--- a/src/collectd.conf.in
+++ b/src/collectd.conf.in
@@ -203,6 +203,7 @@
 #@BUILD_PLUGIN_WRITE_MONGODB_TRUE@LoadPlugin write_mongodb
 #@BUILD_PLUGIN_WRITE_REDIS_TRUE@LoadPlugin write_redis
 #@BUILD_PLUGIN_WRITE_RIEMANN_TRUE@LoadPlugin write_riemann
+#@BUILD_PLUGIN_WRITE_SENSU_TRUE@LoadPlugin write_sensu
 #@BUILD_PLUGIN_WRITE_TSDB_TRUE@LoadPlugin write_tsdb
 #@BUILD_PLUGIN_XMMS_TRUE@LoadPlugin xmms
 #@BUILD_PLUGIN_ZFS_ARC_TRUE@LoadPlugin zfs_arc
@@ -1359,6 +1360,24 @@
 #      Attribute "foo" "bar"
 #</Plugin>
 
+#<Plugin write_sensu>
+#      <Node "example">
+#              Host "localhost"
+#              Port 3030
+#              StoreRates true
+#              AlwaysAppendDS false
+#              Notifications true
+#              Metrics true
+#              EventServicePrefix ""
+#              MetricHandler "influx"
+#              MetricHandler "default"
+#              NotificationHandler "flapjack"
+#              NotificationHandler "howling_monkey"
+#      </Node>
+#      Tag "foobar"
+#      Attribute "foo" "bar"
+#</Plugin>
+
 #<Plugin write_tsdb>
 #      <Node>
 #              Host "localhost"

diff --git a/src/collectd.conf.pod b/src/collectd.conf.pod
index bd7810748e1111b6a13456c0eb5e3ee0fb19b347..fc8fb656d2ba4c935ed9e9ebbfc7284cafdadba8 100644 (file)
--- a/src/collectd.conf.pod
+++ b/src/collectd.conf.pod
@@ -7424,6 +7424,112 @@ attribute for each metric being sent out to I<Riemann>.
 
 =back
 
+=head2 Plugin C<write_sensu>
+
+The I<write_sensu plugin> will send values to I<Sensu>, a powerful stream
+aggregation and monitoring system. The plugin sends I<JSON> encoded data to
+a local I<sensu> client using a TCP socket.
+
+Synopsis:
+
+ <Plugin "write_sensu">
+   <Node "example">
+     Host "localhost"
+     Port "3030"
+     StoreRates true
+     AlwaysAppendDS false
+     MetricHandler "influx"
+     MetricHandler "default"
+     NotificationHandler "flapjack"
+     NotificationHandler "howling_monkey"
+     Notifications true
+   </Node>
+   Tag "foobar"
+   Attribute "foo" "bar"
+ </Plugin>
+
+The following options are understood by the I<write_sensu plugin>:
+
+=over 4
+
+=item E<lt>B<Node> I<Name>E<gt>
+
+The plugin's configuration consists of one or more B<Node> blocks. Each block
+is given a unique I<Name> and specifies one connection to an instance of
+I<Sensu>. Indise the B<Node> block, the following per-connection options are
+understood:
+
+=over 4
+
+=item B<Host> I<Address>
+
+Hostname or address to connect to. Defaults to C<localhost>.
+
+=item B<Port> I<Service>
+
+Service name or port number to connect to. Defaults to C<3030>.
+
+=item B<StoreRates> B<true>|B<false>
+
+If set to B<true> (the default), convert counter values to rates. If set to
+B<false> counter values are stored as is, i.e. as an increasing integer number.
+
+This will be reflected in the C<collectd_data_source_type> tag: If B<StoreRates> is enabled,
+converted values will have "rate" appended to the data source type, e.g.
+C<collectd_data_source_type:derive:rate>.
+
+=item B<AlwaysAppendDS> B<false>|B<true>
+
+If set the B<true>, append the name of the I<Data Source> (DS) to the
+"service", i.e. the field that, together with the "host" field, uniquely
+identifies a metric in I<Sensu>. If set to B<false> (the default), this is
+only done when there is more than one DS.
+
+=item B<Notifications> B<false>|B<true>
+
+If set to B<true>, create sensu events for notifications. This is B<false>
+by default. At least one of B<Notifications> or B<Metrics> should be enabled.
+
+=item B<Metrics> B<false>|B<true>
+
+If set to B<true>, create sensu events for metrics. This is B<false>
+by default. At least one of B<Notifications> or B<Metrics> should be enabled.
+
+
+=item B<Separator> I<String>
+
+Sets the separator for I<Sensu> metrics name or checks. Defaults to "/".
+
+=item B<MetricHandler> I<String>
+
+Add a handler that will be set when metrics are sent to I<Sensu>. You can add
+several of them, one per line. Defaults to no handler.
+
+=item B<NotificationHandler> I<String>
+
+Add a handler that will be set when notifications are sent to I<Sensu>. You can add
+several of them, one per line. Defaults to no handler.
+
+=item B<EventServicePrefix> I<String>
+
+Add the given string as a prefix to the event service name.
+If B<EventServicePrefix> not set or set to an empty string (""),
+no prefix will be used.
+
+=back
+
+=item B<Tag> I<String>
+
+Add the given string as an additional tag to the metric being sent to
+I<Sensu>.
+
+=item B<Attribute> I<String> I<String>
+
+Consider the two given strings to be the key and value of an additional
+attribute for each metric being sent out to I<Sensu>.
+
+=back
+
 =head2 Plugin C<zookeeper>
 
 The I<zookeeper plugin> will collect statistics from a I<Zookeeper> server

diff --git a/src/write_sensu.c b/src/write_sensu.c
new file mode 100644 (file)
index 0000000..706ef46
--- /dev/null
+++ b/src/write_sensu.c
@@ -0,0 +1,1230 @@
+/**
+ * collectd - src/write_sensu.c
+ * Copyright (C) 2015 Fabrice A. Marie
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ *
+ * Authors:
+ *   Fabrice A. Marie <fabrice at kibinlabs.com>
+ */
+
+#include "collectd.h"
+#include "plugin.h"
+#include "common.h"
+#include "configfile.h"
+#include "utils_cache.h"
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include <netdb.h>
+#include <inttypes.h>
+#include <pthread.h>
+#include <stddef.h>
+
+#include <stdlib.h>
+#ifndef HAVE_ASPRINTF
+/*
+ * Uses asprintf() portable implementation from
+ * https://github.com/littlstar/asprintf.c/blob/master/
+ * copyright (c) 2014 joseph werle <joseph.werle@gmail.com> under MIT license.
+ */
+#include <stdio.h>
+#include <stdarg.h>
+
+int vasprintf(char **str, const char *fmt, va_list args) {
+  int size = 0;
+  va_list tmpa;
+  // copy
+  va_copy(tmpa, args);
+  // apply variadic arguments to
+  // sprintf with format to get size
+  size = vsnprintf(NULL, size, fmt, tmpa);
+  // toss args
+  va_end(tmpa);
+  // return -1 to be compliant if
+  // size is less than 0
+  if (size < 0) { return -1; }
+  // alloc with size plus 1 for `\0'
+  *str = (char *) malloc(size + 1);
+  // return -1 to be compliant
+  // if pointer is `NULL'
+  if (NULL == *str) { return -1; }
+  // format string with original
+  // variadic arguments and set new size
+  size = vsprintf(*str, fmt, args);
+  return size;
+}
+
+int asprintf(char **str, const char *fmt, ...) {
+  int size = 0;
+  va_list args;
+  // init variadic argumens
+  va_start(args, fmt);
+  // format and get size
+  size = vasprintf(str, fmt, args);
+  // toss args
+  va_end(args);
+  return size;
+}
+
+#endif
+
+#define SENSU_HOST             "localhost"
+#define SENSU_PORT             "3030"
+
+struct str_list {
+       int nb_strs;
+       char **strs;
+};
+
+struct sensu_host {
+       char                    *name;
+       char                    *event_service_prefix;
+       struct str_list metric_handlers;
+       struct str_list notification_handlers;
+#define F_READY      0x01
+       uint8_t                  flags;
+       pthread_mutex_t  lock;
+       _Bool            notifications;
+       _Bool            metrics;
+       _Bool                    store_rates;
+       _Bool                    always_append_ds;
+       char                    *separator;
+       char                    *node;
+       char                    *service;
+       int              s;
+       struct addrinfo *res;
+       int                          reference_count;
+};
+
+static char    *sensu_tags;
+static char    **sensu_attrs;
+static size_t sensu_attrs_num;
+static const char *alloc_err ="write_sensu plugin: Unable to alloc memory";
+
+static int add_str_to_list(struct str_list *strs,
+               const char *str_to_add) /* {{{ */
+{
+       char **old_strs_ptr = strs->strs;
+       char *newstr = strdup(str_to_add);
+       if (newstr == NULL) {
+               ERROR(alloc_err);
+               return -1;
+       }
+       strs->strs = realloc(strs->strs, sizeof(char *) *(strs->nb_strs + 1));
+       if (strs->strs == NULL) {
+               strs->strs = old_strs_ptr;
+               free(newstr);
+               ERROR(alloc_err);
+               return -1;
+       }
+       strs->strs[strs->nb_strs] = newstr;
+       strs->nb_strs++;
+       return 0;
+}
+/* }}} int add_str_to_list */
+
+static void free_str_list(struct str_list *strs) /* {{{ */
+{
+       int i;
+       for (i=0; i<strs->nb_strs; i++)
+               free(strs->strs[i]);
+       free(strs->strs);
+}
+/* }}} void free_str_list */
+
+static int sensu_connect(struct sensu_host *host) /* {{{ */
+{
+       int                      e;
+       struct addrinfo         *ai, hints;
+       char const              *node;
+       char const              *service;
+
+       // Resolve the target if we haven't done already
+       if (!(host->flags & F_READY)) {
+               memset(&hints, 0, sizeof(hints));
+               memset(&service, 0, sizeof(service));
+               host->res = NULL;
+               hints.ai_family = AF_INET;
+               hints.ai_socktype = SOCK_STREAM;
+#ifdef AI_ADDRCONFIG
+               hints.ai_flags |= AI_ADDRCONFIG;
+#endif
+
+               node = (host->node != NULL) ? host->node : SENSU_HOST;
+               service = (host->service != NULL) ? host->service : SENSU_PORT;
+
+               if ((e = getaddrinfo(node, service, &hints, &(host->res))) != 0) {
+                       ERROR("write_sensu plugin: Unable to resolve host \"%s\": %s",
+                                       node, gai_strerror(e));
+                       return -1;
+               }
+               DEBUG("write_sensu plugin: successfully resolved host/port: %s/%s",
+                               node, service);
+               host->flags |= F_READY;
+       }
+
+       struct linger so_linger;
+       host->s = -1;
+       for (ai = host->res; ai != NULL; ai = ai->ai_next) {
+               // create the socket
+               if ((host->s = socket(ai->ai_family,
+                                     ai->ai_socktype,
+                                     ai->ai_protocol)) == -1) {
+                       continue;
+               }
+
+               // Set very low close() lingering
+               so_linger.l_onoff = 1;
+               so_linger.l_linger = 3;
+               if (setsockopt(host->s, SOL_SOCKET, SO_LINGER, &so_linger, sizeof so_linger) != 0)
+                       WARNING("write_sensu plugin: failed to set socket close() lingering");
+
+               // connect the socket
+               if (connect(host->s, ai->ai_addr, ai->ai_addrlen) != 0) {
+                       close(host->s);
+                       host->s = -1;
+                       continue;
+               }
+               DEBUG("write_sensu plugin: connected");
+               break;
+       }
+
+       if (host->s < 0) {
+               WARNING("write_sensu plugin: Unable to connect to sensu client");
+               return -1;
+       }
+       return 0;
+} /* }}} int sensu_connect */
+
+static void sensu_close_socket(struct sensu_host *host) /* {{{ */
+{
+       if (host->s != -1)
+               close(host->s);
+       host->s = -1;
+
+} /* }}} void sensu_close_socket */
+
+static char *build_json_str_list(const char *tag, struct str_list const *list) /* {{{ */
+{
+       int res;
+       char *ret_str;
+       char *temp_str;
+       int i;
+       if (list->nb_strs == 0) {
+               ret_str = malloc(sizeof(char));
+               if (ret_str == NULL) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str[0] = '\0';
+       }
+
+       res = asprintf(&temp_str, "\"%s\": [\"%s\"", tag, list->strs[0]);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       for (i=1; i<list->nb_strs; i++) {
+               res = asprintf(&ret_str, "%s, \"%s\"", temp_str, list->strs[i]);
+               free(temp_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               temp_str = ret_str;
+       }
+       res = asprintf(&ret_str, "%s]", temp_str);
+       free(temp_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+
+       return ret_str;
+} /* }}} char *build_json_str_list*/
+
+int format_name2(char *ret, int ret_len,
+                const char *hostname,
+                const char *plugin, const char *plugin_instance,
+                const char *type, const char *type_instance,
+                const char *separator)
+{
+  char *buffer;
+  size_t buffer_size;
+
+  buffer = ret;
+  buffer_size = (size_t) ret_len;
+
+#define APPEND(str) do {          \
+  size_t l = strlen (str);        \
+  if (l >= buffer_size)           \
+    return (ENOBUFS);             \
+  memcpy (buffer, (str), l);      \
+  buffer += l; buffer_size -= l;  \
+} while (0)
+
+  assert (plugin != NULL);
+  assert (type != NULL);
+
+  APPEND (hostname);
+  APPEND (separator);
+  APPEND (plugin);
+  if ((plugin_instance != NULL) && (plugin_instance[0] != 0))
+  {
+    APPEND ("-");
+    APPEND (plugin_instance);
+  }
+  APPEND (separator);
+  APPEND (type);
+  if ((type_instance != NULL) && (type_instance[0] != 0))
+  {
+    APPEND ("-");
+    APPEND (type_instance);
+  }
+  assert (buffer_size > 0);
+  buffer[0] = 0;
+
+#undef APPEND
+  return (0);
+} /* int format_name2 */
+
+static void in_place_replace_sensu_name_reserved(char *orig_name) /* {{{ */
+{
+       int i;
+       int len=strlen(orig_name);
+       for (i=0; i<len; i++) {
+               // some plugins like ipmi generate special characters in metric name
+               switch(orig_name[i]) {
+                       case '(': orig_name[i] = '_'; break;
+                       case ')': orig_name[i] = '_'; break;
+                       case ' ': orig_name[i] = '_'; break;
+                       case '"': orig_name[i] = '_'; break;
+                       case '\'': orig_name[i] = '_'; break;
+                       case '+': orig_name[i] = '_'; break;
+               }
+       }
+} /* }}} char *replace_sensu_name_reserved */
+
+static char *sensu_value_to_json(struct sensu_host const *host, /* {{{ */
+               data_set_t const *ds,
+               value_list_t const *vl, size_t index,
+               gauge_t const *rates,
+               int status)
+{
+       char name_buffer[5 * DATA_MAX_NAME_LEN];
+       char service_buffer[6 * DATA_MAX_NAME_LEN];
+       int i;
+       char *ret_str;
+       char *temp_str;
+       char *value_str;
+       int res;
+       // First part of the JSON string
+       const char *part1 = "{\"name\": \"collectd\", \"type\": \"metric\"";
+
+       char *handlers_str = build_json_str_list("handlers", &(host->metric_handlers));
+       if (handlers_str == NULL) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+
+       // incorporate the handlers
+       if (strlen(handlers_str) == 0) {
+               free(handlers_str);
+               ret_str = strdup(part1);
+               if (ret_str == NULL) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+       }
+       else {
+               res = asprintf(&ret_str, "%s, %s", part1, handlers_str);
+               free(handlers_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+       }
+
+       // incorporate the plugin name information
+       res = asprintf(&temp_str, "%s, \"collectd_plugin\": \"%s\"", ret_str, vl->plugin);
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       // incorporate the plugin type
+       res = asprintf(&temp_str, "%s, \"collectd_plugin_type\": \"%s\"", ret_str, vl->type);
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       // incorporate the plugin instance if any
+       if (vl->plugin_instance[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin_instance\": \"%s\"", ret_str, vl->plugin_instance);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the plugin type instance if any
+       if (vl->type_instance[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin_type_instance\": \"%s\"", ret_str, vl->type_instance);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the data source type
+       if ((ds->ds[index].type != DS_TYPE_GAUGE) && (rates != NULL)) {
+               char ds_type[DATA_MAX_NAME_LEN];
+               ssnprintf (ds_type, sizeof (ds_type), "%s:rate", DS_TYPE_TO_STRING(ds->ds[index].type));
+               res = asprintf(&temp_str, "%s, \"collectd_data_source_type\": \"%s\"", ret_str, ds_type);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       } else {
+               res = asprintf(&temp_str, "%s, \"collectd_data_source_type\": \"%s\"", ret_str, DS_TYPE_TO_STRING(ds->ds[index].type));
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the data source name
+       res = asprintf(&temp_str, "%s, \"collectd_data_source_name\": \"%s\"", ret_str, ds->ds[index].name);
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       // incorporate the data source index
+       {
+               char ds_index[DATA_MAX_NAME_LEN];
+               ssnprintf (ds_index, sizeof (ds_index), "%zu", index);
+               res = asprintf(&temp_str, "%s, \"collectd_data_source_index\": %s", ret_str, ds_index);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // add key value attributes from config if any
+       for (i = 0; i < sensu_attrs_num; i += 2) {
+               res = asprintf(&temp_str, "%s, \"%s\": \"%s\"", ret_str, sensu_attrs[i], sensu_attrs[i+1]);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate sensu tags from config if any
+       if (strlen(sensu_tags) != 0) {
+               res = asprintf(&temp_str, "%s, %s", ret_str, sensu_tags);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // calculate the value and set to a string
+       if (ds->ds[index].type == DS_TYPE_GAUGE) {
+               double tmp_v = (double) vl->values[index].gauge;
+               res = asprintf(&value_str, "%.8f", tmp_v, sensu_tags);
+               if (res == -1) {
+                       free(ret_str);
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+       } else if (rates != NULL) {
+               double tmp_v = (double) rates[index];
+               res = asprintf(&value_str, "%.8f", tmp_v, sensu_tags);
+               if (res == -1) {
+                       free(ret_str);
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+       } else {
+               int64_t tmp_v;
+               if (ds->ds[index].type == DS_TYPE_DERIVE)
+                       tmp_v = (int64_t) vl->values[index].derive;
+               else if (ds->ds[index].type == DS_TYPE_ABSOLUTE)
+                       tmp_v = (int64_t) vl->values[index].absolute;
+               else
+                       tmp_v = (int64_t) vl->values[index].counter;
+               res = asprintf(&value_str, "%lld", tmp_v, sensu_tags);
+               if (res == -1) {
+                       free(ret_str);
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+       }
+
+       // Generate the full service name
+       format_name2(name_buffer, sizeof(name_buffer),
+               vl->host, vl->plugin, vl->plugin_instance,
+               vl->type, vl->type_instance, host->separator);
+       if (host->always_append_ds || (ds->ds_num > 1)) {
+               if (host->event_service_prefix == NULL)
+                       ssnprintf(service_buffer, sizeof(service_buffer), "%s.%s",
+                                       name_buffer, ds->ds[index].name);
+               else
+                       ssnprintf(service_buffer, sizeof(service_buffer), "%s%s.%s",
+                                       host->event_service_prefix, name_buffer, ds->ds[index].name);
+       } else {
+               if (host->event_service_prefix == NULL)
+                       sstrncpy(service_buffer, name_buffer, sizeof(service_buffer));
+               else
+                       ssnprintf(service_buffer, sizeof(service_buffer), "%s%s",
+                                       host->event_service_prefix, name_buffer);
+       }
+
+       // Replace collectd sensor name reserved characters so that time series DB is happy
+       in_place_replace_sensu_name_reserved(service_buffer);
+
+       // finalize the buffer by setting the output and closing curly bracket
+       res = asprintf(&temp_str, "%s, \"output\": \"%s %s %ld\"}\n", ret_str, service_buffer, value_str, CDTIME_T_TO_TIME_T(vl->time));
+       free(ret_str);
+       free(value_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       DEBUG("write_sensu plugin: Successfully created json for metric: "
+                       "host = \"%s\", service = \"%s\"",
+                       vl->host, service_buffer);
+       return ret_str;
+} /* }}} char *sensu_value_to_json */
+
+/*
+ * Uses replace_str2() implementation from
+ * http://creativeandcritical.net/str-replace-c/
+ * copyright (c) Laird Shaw, under public domain.
+ */
+char *replace_str(const char *str, const char *old, /* {{{ */
+               const char *new)
+{
+       char *ret, *r;
+       const char *p, *q;
+       size_t oldlen = strlen(old);
+       size_t count = strlen(new);
+       size_t retlen = count;
+       size_t newlen = count;
+       int samesize = (oldlen == newlen);
+
+       if (!samesize) {
+               for (count = 0, p = str; (q = strstr(p, old)) != NULL; p = q + oldlen)
+                       count++;
+               /* This is undefined if p - str > PTRDIFF_MAX */
+               retlen = p - str + strlen(p) + count * (newlen - oldlen);
+       } else
+               retlen = strlen(str);
+
+       ret = malloc(retlen + 1);
+       if (ret == NULL)
+               return NULL;
+       // added to original: not optimized, but keeps valgrind happy.
+       memset(ret, 0, retlen + 1);
+
+       r = ret;
+       p = str;
+       while (1) {
+               /* If the old and new strings are different lengths - in other
+                * words we have already iterated through with strstr above,
+                * and thus we know how many times we need to call it - then we
+                * can avoid the final (potentially lengthy) call to strstr,
+                * which we already know is going to return NULL, by
+                * decrementing and checking count.
+                */
+               if (!samesize && !count--)
+                       break;
+               /* Otherwise i.e. when the old and new strings are the same
+                * length, and we don't know how many times to call strstr,
+                * we must check for a NULL return here (we check it in any
+                * event, to avoid further conditions, and because there's
+                * no harm done with the check even when the old and new
+                * strings are different lengths).
+                */
+               if ((q = strstr(p, old)) == NULL)
+                       break;
+               /* This is undefined if q - p > PTRDIFF_MAX */
+               ptrdiff_t l = q - p;
+               memcpy(r, p, l);
+               r += l;
+               memcpy(r, new, newlen);
+               r += newlen;
+               p = q + oldlen;
+       }
+       strncpy(r, p, strlen(p));
+
+       return ret;
+} /* }}} char *replace_str */
+
+static char *replace_json_reserved(const char *message) /* {{{ */
+{
+       char *msg = replace_str(message, "\\", "\\\\");
+       if (msg == NULL) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       char *tmp = replace_str(msg, "\"", "\\\"");
+       free(msg);
+       if (tmp == NULL) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       msg = replace_str(tmp, "\n", "\\\n");
+       free(tmp);
+       if (msg == NULL) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       return msg;
+} /* }}} char *replace_json_reserved */
+
+static char *sensu_notification_to_json(struct sensu_host *host, /* {{{ */
+               notification_t const *n)
+{
+       char service_buffer[6 * DATA_MAX_NAME_LEN];
+       char const *severity;
+       notification_meta_t *meta;
+       char *ret_str;
+       char *temp_str;
+       int status;
+       int i;
+       int res;
+       // add the severity/status
+       switch (n->severity) {
+               case NOTIF_OKAY:
+                       severity = "OK";
+                       status = 0;
+                       break;
+               case NOTIF_WARNING:
+                       severity = "WARNING";
+                       status = 1;
+                       break;
+               case NOTIF_FAILURE:
+                       severity = "CRITICAL";
+                       status = 2;
+                       break;
+               default:
+                       severity = "UNKNOWN";
+                       status = 3;
+       }
+       res = asprintf(&temp_str, "{\"status\": %d", status);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       // incorporate the timestamp
+       res = asprintf(&temp_str, "%s, \"timestamp\": %ld", ret_str, CDTIME_T_TO_TIME_T(n->time));
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       char *handlers_str = build_json_str_list("handlers", &(host->notification_handlers));
+       if (handlers_str == NULL) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       // incorporate the handlers
+       if (strlen(handlers_str) != 0) {
+               res = asprintf(&temp_str, "%s, %s", ret_str, handlers_str);
+               free(ret_str);
+               free(handlers_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       } else {
+               free(handlers_str);
+       }
+
+       // incorporate the plugin name information if any
+       if (n->plugin[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin\": \"%s\"", ret_str, n->plugin);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the plugin type if any
+       if (n->type[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin_type\": \"%s\"", ret_str, n->type);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the plugin instance if any
+       if (n->plugin_instance[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin_instance\": \"%s\"", ret_str, n->plugin_instance);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the plugin type instance if any
+       if (n->type_instance[0] != 0) {
+               res = asprintf(&temp_str, "%s, \"collectd_plugin_type_instance\": \"%s\"", ret_str, n->type_instance);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // add key value attributes from config if any
+       for (i = 0; i < sensu_attrs_num; i += 2) {
+               res = asprintf(&temp_str, "%s, \"%s\": \"%s\"", ret_str, sensu_attrs[i], sensu_attrs[i+1]);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate sensu tags from config if any
+       if (strlen(sensu_tags) != 0) {
+               res = asprintf(&temp_str, "%s, %s", ret_str, sensu_tags);
+               free(ret_str);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // incorporate the service name
+       format_name2(service_buffer, sizeof(service_buffer),
+                               /* host */ "", n->plugin, n->plugin_instance,
+                               n->type, n->type_instance, host->separator);
+       // replace sensu event name chars that are considered illegal
+       in_place_replace_sensu_name_reserved(service_buffer);
+       res = asprintf(&temp_str, "%s, \"name\": \"%s\"", ret_str, &service_buffer[1]);
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       // incorporate the check output
+       if (n->message[0] != 0) {
+               char *msg = replace_json_reserved(n->message);
+               if (msg == NULL) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               res = asprintf(&temp_str, "%s, \"output\": \"%s - %s\"", ret_str, severity, msg);
+               free(ret_str);
+               free(msg);
+               if (res == -1) {
+                       ERROR(alloc_err);
+                       return NULL;
+               }
+               ret_str = temp_str;
+       }
+
+       // Pull in values from threshold and add extra attributes
+       for (meta = n->meta; meta != NULL; meta = meta->next) {
+               if (strcasecmp("CurrentValue", meta->name) == 0 && meta->type == NM_TYPE_DOUBLE) {
+                       res = asprintf(&temp_str, "%s, \"current_value\": \"%.8f\"", ret_str, meta->nm_value.nm_double);
+                       free(ret_str);
+                       if (res == -1) {
+                               ERROR(alloc_err);
+                               return NULL;
+                       }
+                       ret_str = temp_str;
+               }
+               if (meta->type == NM_TYPE_STRING) {
+                       res = asprintf(&temp_str, "%s, \"%s\": \"%s\"", ret_str, meta->name, meta->nm_value.nm_string);
+                       free(ret_str);
+                       if (res == -1) {
+                               ERROR(alloc_err);
+                               return NULL;
+                       }
+                       ret_str = temp_str;
+               }
+       }
+
+       // close the curly bracket
+       res = asprintf(&temp_str, "%s}\n", ret_str);
+       free(ret_str);
+       if (res == -1) {
+               ERROR(alloc_err);
+               return NULL;
+       }
+       ret_str = temp_str;
+
+       DEBUG("write_sensu plugin: Successfully created JSON for notification: "
+                               "host = \"%s\", service = \"%s\", state = \"%s\"",
+                               n->host, service_buffer, severity);
+       return ret_str;
+} /* }}} char *sensu_notification_to_json */
+
+static int sensu_send_msg(struct sensu_host *host, const char *msg) /* {{{ */
+{
+       int status = 0;
+       size_t  buffer_len;
+
+       status = sensu_connect(host);
+       if (status != 0)
+               return status;
+
+       buffer_len = strlen(msg);
+
+       status = (int) swrite(host->s, msg, buffer_len);
+       sensu_close_socket(host);
+
+       if (status != 0) {
+               char errbuf[1024];
+               ERROR("write_sensu plugin: Sending to Sensu at %s:%s failed: %s",
+                               (host->node != NULL) ? host->node : SENSU_HOST,
+                               (host->service != NULL) ? host->service : SENSU_PORT,
+                               sstrerror(errno, errbuf, sizeof(errbuf)));
+               return -1;
+       }
+
+       return 0;
+} /* }}} int sensu_send_msg */
+
+
+static int sensu_send(struct sensu_host *host, char const *msg) /* {{{ */
+{
+       int status = 0;
+
+       status = sensu_send_msg(host, msg);
+       if (status != 0) {
+               host->flags &= ~F_READY;
+               if (host->res != NULL) {
+                       freeaddrinfo(host->res);
+                       host->res = NULL;
+               }
+               return status;
+       }
+
+       return 0;
+} /* }}} int sensu_send */
+
+
+static int sensu_write(const data_set_t *ds, /* {{{ */
+             const value_list_t *vl,
+             user_data_t *ud)
+{
+       int status = 0;
+       int statuses[vl->values_len];
+       struct sensu_host       *host = ud->data;
+       gauge_t *rates = NULL;
+       int i;
+       char *msg;
+
+       pthread_mutex_lock(&host->lock);
+
+       if (host->store_rates) {
+               rates = uc_get_rate(ds, vl);
+               if (rates == NULL) {
+                       ERROR("write_sensu plugin: uc_get_rate failed.");
+                       pthread_mutex_unlock(&host->lock);
+                       return -1;
+               }
+       }
+       for (i = 0; i < (size_t) vl->values_len; i++) {
+               msg = sensu_value_to_json(host, ds, vl, (int) i, rates, statuses[i]);
+               if (msg == NULL) {
+                       sfree(rates);
+                       pthread_mutex_unlock(&host->lock);
+                       return -1;
+               }
+               status = sensu_send(host, msg);
+               free(msg);
+               if (status != 0) {
+                       ERROR("write_sensu plugin: sensu_send failed with status %i", status);
+                       pthread_mutex_unlock(&host->lock);
+                       sfree(rates);
+                       return status;
+               }
+       }
+       sfree(rates);
+       pthread_mutex_unlock(&host->lock);
+       return status;
+} /* }}} int sensu_write */
+
+static int sensu_notification(const notification_t *n, user_data_t *ud) /* {{{ */
+{
+       int     status;
+       struct sensu_host *host = ud->data;
+       char *msg;
+
+       pthread_mutex_lock(&host->lock);
+
+       msg = sensu_notification_to_json(host, n);
+       if (msg == NULL) {
+               pthread_mutex_unlock(&host->lock);
+               return -1;
+       }
+
+       status = sensu_send(host, msg);
+       free(msg);
+       if (status != 0)
+               ERROR("write_sensu plugin: sensu_send failed with status %i", status);
+       pthread_mutex_unlock(&host->lock);
+
+       return status;
+} /* }}} int sensu_notification */
+
+static void sensu_free(void *p) /* {{{ */
+{
+       struct sensu_host *host = p;
+
+       if (host == NULL)
+               return;
+
+       pthread_mutex_lock(&host->lock);
+
+       host->reference_count--;
+       if (host->reference_count > 0) {
+               pthread_mutex_unlock(&host->lock);
+               return;
+       }
+
+       sensu_close_socket(host);
+       if (host->res != NULL) {
+               freeaddrinfo(host->res);
+               host->res = NULL;
+       }
+       sfree(host->service);
+       sfree(host->event_service_prefix);
+       sfree(host->name);
+       sfree(host->node);
+       sfree(host->separator);
+       free_str_list(&(host->metric_handlers));
+       free_str_list(&(host->notification_handlers));
+       pthread_mutex_destroy(&host->lock);
+       sfree(host);
+} /* }}} void sensu_free */
+
+
+static int sensu_config_node(oconfig_item_t *ci) /* {{{ */
+{
+       struct sensu_host       *host = NULL;
+       int                                     status = 0;
+       int                                     i;
+       oconfig_item_t          *child;
+       char                            callback_name[DATA_MAX_NAME_LEN];
+       user_data_t                     ud;
+
+       if ((host = calloc(1, sizeof(*host))) == NULL) {
+               ERROR("write_sensu plugin: calloc failed.");
+               return ENOMEM;
+       }
+       pthread_mutex_init(&host->lock, NULL);
+       host->reference_count = 1;
+       host->node = NULL;
+       host->service = NULL;
+       host->notifications = 0;
+       host->metrics = 0;
+       host->store_rates = 1;
+       host->always_append_ds = 0;
+       host->metric_handlers.nb_strs = 0;
+       host->metric_handlers.strs = NULL;
+       host->notification_handlers.nb_strs = 0;
+       host->notification_handlers.strs = NULL;
+       host->separator = strdup("/");
+       if (host->separator == NULL) {
+               ERROR(alloc_err);
+               sensu_free(host);
+               return -1;
+       }
+
+       status = cf_util_get_string(ci, &host->name);
+       if (status != 0) {
+               WARNING("write_sensu plugin: Required host name is missing.");
+               sensu_free(host);
+               return -1;
+       }
+
+       for (i = 0; i < ci->children_num; i++) {
+               child = &ci->children[i];
+               status = 0;
+
+               if (strcasecmp("Host", child->key) == 0) {
+                       status = cf_util_get_string(child, &host->node);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("Notifications", child->key) == 0) {
+                       status = cf_util_get_boolean(child, &host->notifications);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("Metrics", child->key) == 0) {
+                                       status = cf_util_get_boolean(child, &host->metrics);
+                                       if (status != 0)
+                                               break;
+               } else if (strcasecmp("EventServicePrefix", child->key) == 0) {
+                       status = cf_util_get_string(child, &host->event_service_prefix);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("Separator", child->key) == 0) {
+                               status = cf_util_get_string(child, &host->separator);
+                               if (status != 0)
+                                       break;
+               } else if (strcasecmp("MetricHandler", child->key) == 0) {
+                       char *temp_str = NULL;
+                       status = cf_util_get_string(child, &temp_str);
+                       if (status != 0)
+                               break;
+                       status = add_str_to_list(&(host->metric_handlers), temp_str);
+                       free(temp_str);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("NotificationHandler", child->key) == 0) {
+                       char *temp_str = NULL;
+                       status = cf_util_get_string(child, &temp_str);
+                       if (status != 0)
+                               break;
+                       status = add_str_to_list(&(host->notification_handlers), temp_str);
+                       free(temp_str);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("Port", child->key) == 0) {
+                       status = cf_util_get_service(child, &host->service);
+                       if (status != 0) {
+                               ERROR("write_sensu plugin: Invalid argument "
+                                               "configured for the \"Port\" "
+                                               "option.");
+                               break;
+                       }
+               } else if (strcasecmp("StoreRates", child->key) == 0) {
+                       status = cf_util_get_boolean(child, &host->store_rates);
+                       if (status != 0)
+                               break;
+               } else if (strcasecmp("AlwaysAppendDS", child->key) == 0) {
+                       status = cf_util_get_boolean(child,
+                                       &host->always_append_ds);
+                       if (status != 0)
+                               break;
+               } else {
+                       WARNING("write_sensu plugin: ignoring unknown config "
+                               "option: \"%s\"", child->key);
+               }
+       }
+       if (status != 0) {
+               sensu_free(host);
+               return status;
+       }
+
+       if (host->metrics && (host->metric_handlers.nb_strs == 0)) {
+                       sensu_free(host);
+                       WARNING("write_sensu plugin: metrics enabled but no MetricHandler defined. Giving up.");
+                       return -1;
+               }
+
+       if (host->notifications && (host->notification_handlers.nb_strs == 0)) {
+               sensu_free(host);
+               WARNING("write_sensu plugin: notifications enabled but no NotificationHandler defined. Giving up.");
+               return -1;
+       }
+
+       if ((host->notification_handlers.nb_strs > 0) && (host->notifications == 0)) {
+               WARNING("write_sensu plugin: NotificationHandler given so forcing notifications to be enabled");
+               host->notifications = 1;
+       }
+
+       if ((host->metric_handlers.nb_strs > 0) && (host->metrics == 0)) {
+               WARNING("write_sensu plugin: MetricHandler given so forcing metrics to be enabled");
+               host->metrics = 1;
+       }
+
+       if (!(host->notifications || host->metrics)) {
+               WARNING("write_sensu plugin: neither metrics nor notifications enabled. Giving up.");
+               sensu_free(host);
+               return -1;
+       }
+
+       ssnprintf(callback_name, sizeof(callback_name), "write_sensu/%s", host->name);
+       ud.data = host;
+       ud.free_func = sensu_free;
+
+       pthread_mutex_lock(&host->lock);
+
+       if (host->metrics) {
+               status = plugin_register_write(callback_name, sensu_write, &ud);
+               if (status != 0)
+                       WARNING("write_sensu plugin: plugin_register_write (\"%s\") "
+                                       "failed with status %i.",
+                                       callback_name, status);
+               else /* success */
+                       host->reference_count++;
+       }
+
+       if (host->notifications) {
+               status = plugin_register_notification(callback_name, sensu_notification, &ud);
+               if (status != 0)
+                       WARNING("write_sensu plugin: plugin_register_notification (\"%s\") "
+                                       "failed with status %i.",
+                                       callback_name, status);
+               else
+                       host->reference_count++;
+       }
+
+       if (host->reference_count <= 1) {
+               /* Both callbacks failed => free memory.
+                * We need to unlock here, because sensu_free() will lock.
+                * This is not a race condition, because we're the only one
+                * holding a reference. */
+               pthread_mutex_unlock(&host->lock);
+               sensu_free(host);
+               return -1;
+       }
+
+       host->reference_count--;
+       pthread_mutex_unlock(&host->lock);
+
+       return status;
+} /* }}} int sensu_config_node */
+
+static int sensu_config(oconfig_item_t *ci) /* {{{ */
+{
+       int              i;
+       oconfig_item_t  *child;
+       int              status;
+       struct str_list sensu_tags_arr;
+
+       sensu_tags_arr.nb_strs = 0;
+       sensu_tags_arr.strs = NULL;
+       sensu_tags = malloc(sizeof(char));
+       if (sensu_tags == NULL) {
+               ERROR(alloc_err);
+               return -1;
+       }
+       sensu_tags[0] = '\0';
+
+       for (i = 0; i < ci->children_num; i++)  {
+               child = &ci->children[i];
+
+               if (strcasecmp("Node", child->key) == 0) {
+                       sensu_config_node(child);
+               } else if (strcasecmp(child->key, "attribute") == 0) {
+                       char *key = NULL;
+                       char *val = NULL;
+
+                       if (child->values_num != 2) {
+                               WARNING("sensu attributes need both a key and a value.");
+                               free(sensu_tags);
+                               return -1;
+                       }
+                       if (child->values[0].type != OCONFIG_TYPE_STRING ||
+                           child->values[1].type != OCONFIG_TYPE_STRING) {
+                               WARNING("sensu attribute needs string arguments.");
+                               free(sensu_tags);
+                               return -1;
+                       }
+                       if ((key = strdup(child->values[0].value.string)) == NULL) {
+                               ERROR(alloc_err);
+                               free(sensu_tags);
+                               return -1;
+                       }
+                       if ((val = strdup(child->values[1].value.string)) == NULL) {
+                               free(sensu_tags);
+                               ERROR(alloc_err);
+                               return -1;
+                       }
+                       strarray_add(&sensu_attrs, &sensu_attrs_num, key);
+                       strarray_add(&sensu_attrs, &sensu_attrs_num, val);
+                       DEBUG("write_sensu: got attr: %s => %s", key, val);
+                       sfree(key);
+                       sfree(val);
+               } else if (strcasecmp(child->key, "tag") == 0) {
+                       char *tmp = NULL;
+                       status = cf_util_get_string(child, &tmp);
+                       if (status != 0)
+                               continue;
+
+                       status = add_str_to_list(&sensu_tags_arr, tmp);
+                       sfree(tmp);
+                       if (status != 0)
+                               continue;
+                       DEBUG("write_sensu plugin: Got tag: %s", tmp);
+               } else {
+                       WARNING("write_sensu plugin: Ignoring unknown "
+                                "configuration option \"%s\" at top level.",
+                                child->key);
+               }
+       }
+       if (sensu_tags_arr.nb_strs > 0) {
+               free(sensu_tags);
+               sensu_tags = build_json_str_list("tags", &sensu_tags_arr);
+               free_str_list(&sensu_tags_arr);
+               if (sensu_tags == NULL) {
+                       ERROR(alloc_err);
+                       return -1;
+               }
+       }
+       return 0;
+} /* }}} int sensu_config */
+
+void module_register(void)
+{
+       plugin_register_complex_config("write_sensu", sensu_config);
+}
+
+/* vim: set sw=8 sts=8 ts=8 noet : */