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CHANGELOG

This file documents important changes to the Elasticsearch plugin for collectd.

2016-08-08: Restore compatibility with python v2.6

This latest revision restores compatibility with Python v2.6.

2016-07-21: Dimensionalize thread pool metrics by thread pool

Prior to this update, the plugin transmitted thread pool metrics with the names of thread pools included as part of the metric name.

Ex. (Where thread_pool is "search")

counter.thread_pool.search.rejected

This update removes the name of the thread pool from the metric name and instead attaches the name of the thread pool in a dimension named "thread_pool".

Ex. (Where thread_pool is "search")

counter.thread_pool.rejected
# The metric above now has the dimension 
# named "thread_pool" set to "search"

SignalFx's built-in dashboards have been updated to accommodate metrics from both before and after this change.

When you upgrade to this version, any custom SignalFx charts and detectors that you have built that include thread pool metrics will need to be modified to include the new metric names. Modify charts as follows:

  1. Whenever a chart uses a metric like counter.thread_pool.search.rejected, add a new plot to the chart that uses the metric counter.thread_pool.rejected.
  2. On the new plot, apply a filter by the dimension thread_pool, with value search, to match the previous metric.
  3. If your chart uses a timeseries expression that refers to the previous metric, clone the expression, then modify any letter references in the clone to refer to the new plot instead of the old one.

For detectors, follow the procedure above, then select the new plot or new timeseries expression as the signal.

2016-06-28: Changes to basic plugin configuration

Control level of metrics detail

Before this update, the plugin transmitted every metric available from Elasticsearch's stats API. Available metrics are now segmented into two sets: "default", a curated set of metrics used in SignalFx's built-in dashboards for this plugin, and "detailed" which includes all available metrics. Control the set of metrics that will be transmitted in the DetailedMetrics configuration parameter. To capture additional metrics beyond those in the default set without enabling DetailedMetrics, use the AdditionalMetrics configuration parameter.

DetailedMetrics is evaluated before EnableIndexStats and EnableClusterStats. If DetailedMetrics is false, setting EnableIndexStats and EnableClusterStats to true will cause the plugin to report only those index and cluster metrics that are included in the default set of metrics.

Specify secondary collection interval for index stats

This update includes a separate collection interval for index stats, specified in IndexInterval. This was added because the collection of index stats in particular can be CPU-intensive. The default setting of this interval in 20-elasticsearch.conf transmits index stats every 5 minutes.

Address missing metric mappings in recent versions of Elasticsearch

This update adds compatibility with more recent versions of Elasticsearch up to 2.1, in which some metric names have changed. Before this update, the plugin would log errors that metrics could not be found.

2016-06-27: Support for basic authentication

The plugin was updated to support basic authentication with Elasticsearch installations. You can now supply username and password in the configuration file for this plugin.