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
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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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