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https://issues.apache.org/jira/browse/SOLR-15081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17268260#comment-17268260
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ASF subversion and git services commented on SOLR-15081:
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Commit 37545c0da762ec2437cd982c7d40dbe9075ecf0c in lucene-solr's branch
refs/heads/branch_8x from David Smiley
[ https://gitbox.apache.org/repos/asf?p=lucene-solr.git;h=37545c0 ]
SOLR-15081: Metrics for core: isLeader, replicaState (#2198)
Note that getLastPublished returns an Enum type. TextWriter.writeVal should
probably support Enums, which would simplify this code.
(cherry picked from commit a233ed2fd1bc7e0f6366f74d33ec21007aec90bc)
> Metrics per core: report leader true/false and replica state
> ------------------------------------------------------------
>
> Key: SOLR-15081
> URL: https://issues.apache.org/jira/browse/SOLR-15081
> Project: Solr
> Issue Type: Improvement
> Security Level: Public(Default Security Level. Issues are Public)
> Components: metrics
> Reporter: David Smiley
> Priority: Major
> Time Spent: 1h 40m
> Remaining Estimate: 0h
>
> The core level metrics hold some interesting information, but I don't see
> information pertaining to the SolrCloud status of the core. In particular,
> I'd like to see the leader status here, and also the replica state. The
> use-case I have in mind is enabling the Prometheus Exporter to get the doc
> count (and maybe other basics) of only the leader replicas, thereby counting
> unique documents instead of a fully replicated figure. This is an
> approximation to doing a match-all-docs query on all collections, but is a
> more sound approach when one has orders of magnitude more collections than
> nodes.
> ----
> Final change: add "isLeader" and "replicaState" metrics per core.
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