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https://issues.apache.org/jira/browse/SOLR-15081?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mayya Sharipova closed SOLR-15081.
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Closing after the 8.9.0 release
> 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
> Components: metrics
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Fix For: 8.9
>
> 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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