georgew5656 opened a new pull request, #16072:
URL: https://github.com/apache/druid/pull/16072

   Addressing some followup comments from the change in the metric made in 
https://github.com/apache/druid/pull/16020
   
   ### Description
   If a datasource has a replicaCount=0 rule that applies to some segments that 
are not covered by a replicaCount>0 rule, those segments will not be reported 
as available in segment/unavailable/count. Since they are not queryable by 
native queries (only using the query from deep storage feature), we want a 
separate metric that lets us check how many segments fit these criteria.
   
   #### Fixed the bug ...
   #### Renamed the class ...
   #### Added a forbidden-apis entry ...
   Add metric segment/deepStorage/count that counts the number of segments that 
are only queryable through the query from deep storage metric.
   
   #### Release note
   New metric to support query from deep storage feature.
   
   ##### Key changed/added classes in this PR
    * `DruidCoordinator`
    * `Stats`
   
   This PR has:
   
   - [X] been self-reviewed.
      - [ ] using the [concurrency 
checklist](https://github.com/apache/druid/blob/master/dev/code-review/concurrency.md)
 (Remove this item if the PR doesn't have any relation to concurrency.)
   - [ ] added documentation for new or modified features or behaviors.
   - [ ] a release note entry in the PR description.
   - [ ] added Javadocs for most classes and all non-trivial methods. Linked 
related entities via Javadoc links.
   - [ ] added or updated version, license, or notice information in 
[licenses.yaml](https://github.com/apache/druid/blob/master/dev/license.md)
   - [ ] added comments explaining the "why" and the intent of the code 
wherever would not be obvious for an unfamiliar reader.
   - [X] added unit tests or modified existing tests to cover new code paths, 
ensuring the threshold for [code 
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
 is met.
   - [ ] added integration tests.
   - [X] been tested in a test Druid cluster.
   


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