[GitHub] [druid] edenmist opened a new pull request #11287: Add metrics for thread, pool, and realtime process.

[GitBox <gi...@apache.org>]

edenmist opened a new pull request #11287:
URL: https://github.com/apache/druid/pull/11287


   ### Description
   Add metrics for druid thread usage, buffer pool usage, and realtime ingestion in-memory data status.
   
   ##### Key changed/added classes in this PR
    * `TaskRealtimeMetricsMonitor`
    * `MetricsEmittingExecutorService`
    *  `PrioritizedExecutorService`
    *  `FireDepartmentMetrics`
    *  `AppenderatorImpl`
    * `QueryBufferPoolStatsMonitor`
   
   <hr>
   
   <!-- Check the items by putting "x" in the brackets for the done things. Not all of these items apply to every PR. Remove the items which are not done or not relevant to the PR. None of the items from the checklist below are strictly necessary, but it would be very helpful if you at least self-review the PR. -->
   
   This PR has:
   - [x] been self-reviewed.
   - [x] added documentation for new or modified features or behaviors.
   - [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.
   - [x] been tested in a test Druid cluster.
   


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