liangkaiwen opened a new pull request, #3682:
URL: https://github.com/apache/solr/pull/3682

   https://issues.apache.org/jira/browse/SOLR-17806
   
   
   # Description
   
   Replace existing segment merge metrics with consistent counters
   
   # Solution
   
   * Enabled segment merge metrics by default (configurable threshold for major 
merges behavior is unchanged)
   * Removed the index merge running gauge metrics
   
   Added the following index merge metrics:
   
   * solr_indexwriter_merge_time
   * solr_indexwriter_merge_errors
   * solr_indexwriter_flushes
   * solr_indexwriter_merges
   * solr_indexwriter_docs_merged
   * solr_indexwriter_docs_deleted
   * solr_indexwriter_segments
   
   Also added labels for `merge_type` (minor / major) and `merge_state` 
(started / finished). In this way the counters are consistent and monotonically 
increasing. To get the current state of a merge, the current started metric can 
be subtracted from the current finished metric.
   
   # Tests
   
   * Updated existing merge metrics tests
   
   # Checklist
   
   Please review the following and check all that apply:
   
   - [X] I have reviewed the guidelines for [How to 
Contribute](https://github.com/apache/solr/blob/main/CONTRIBUTING.md) and my 
code conforms to the standards described there to the best of my ability.
   - [X] I have created a Jira issue and added the issue ID to my pull request 
title.
   - [X] I have given Solr maintainers 
[access](https://help.github.com/en/articles/allowing-changes-to-a-pull-request-branch-created-from-a-fork)
 to contribute to my PR branch. (optional but recommended, not available for 
branches on forks living under an organisation)
   - [X] I have developed this patch against the `main` branch.
   - [X] I have run `./gradlew check`.
   - [X] I have added tests for my changes.
   - [X] I have added documentation for the [Reference 
Guide](https://github.com/apache/solr/tree/main/solr/solr-ref-guide)
   


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