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https://issues.apache.org/jira/browse/SOLR-9898?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15795262#comment-15795262
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Andrzej Bialecki commented on SOLR-9898:
-----------------------------------------
h1. Index merge metrics
These metrics are collected in respective registries for each core, under the
{{INDEX}} category. Basic metrics are always collected - collection of
additional metrics can be turned on using boolean parameters in the
{{/config/indexConfig/metrics}} section of {{solrconfig.xml}}:
{code}
<config>
...
<indexConfig>
<metrics>
<majorMergeDocs>524288</majorMergeDocs>
<bool name="mergeDetails">true</bool>
<bool name="directoryDetails">true</bool>
</metrics>
...
</indexConfig>
...
</config>
{code}
The following metrics are collected:
* {{INDEX.merge.major}} - timer for merge operations that include at least
"majorMergeDocs" (default value for this parameter is 512k documents).
* {{INDEX.merge.minor}} - timer for merge operations that include less than
"majorMergeDocs".
* {{INDEX.merge.errors}} - counter for merge errors.
* {{INDEX.flush}} - meter for index flush operations.
Additionally, the following gauges are reported, which help to monitor the
momentary state of index merge operations:
* {{INDEX.merge.major.running}} - number of running major merge operations
(depending on the implementation of {{MergeScheduler}} that is used there can
be several concurrently running merge operations).
* {{INDEX.merge.minor.running}} - as above, for minor merge operations.
* {{INDEX.merge.major.running.docs}} - total number of documents in the
segments being currently merged in major merge operations.
* {{INDEX.merge.minor.running.docs}} - as above, for minor merge operations.
* {{INDEX.merge.major.running.segments}} - number of segments being currently
merged in major merge operations.
* {{INDEX.merge.minor.running.segments}} - as above, for minor merge operations.
If the boolean flag {{mergeDetails}} is true then the following additional
metrics are collected:
* {{INDEX.merge.major.docs}} - meter for the number of documents merged in
major merge operations
* {{INDEX.merge.major.deletedDocs}} - meter for the number of deleted documents
expunged in major merge operations
> Documentation for metrics collection and /admin/metrics
> -------------------------------------------------------
>
> Key: SOLR-9898
> URL: https://issues.apache.org/jira/browse/SOLR-9898
> Project: Solr
> Issue Type: Task
> Security Level: Public(Default Security Level. Issues are Public)
> Components: documentation
> Affects Versions: master (7.0), 6.4
> Reporter: Andrzej Bialecki
> Assignee: Cassandra Targett
>
> Draft documentation follows.
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