[jira] [Created] (SOLR-15081) Metrics per core: report leader true/false and replica state

["David Smiley (Jira)" <ji...@apache.org>]

David Smiley created SOLR-15081:
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             Summary: 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


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.



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