himanshug opened a new pull request #8561: make it possible to not emit cache 
metrics and disable by default
URL: https://github.com/apache/incubator-druid/pull/8561
 
 
   Fixes #8460
   
   ### Description
   Disables emitting of cache metrics by default and makes them optional. After 
this patch users would need to add 
`"org.apache.druid.client.cache.CacheMonitor"` to `druid.monitoring.monitors` 
property like others . It is already documented.
   
   Cache is disabled by default as `druid.realtime.cache.useCache` and 
`druid.realtime.cache.populateCache` are both set to `false` and so should be 
cache metrics.
   <hr>
   
   This PR has:
   - [X] been self-reviewed.
   - [X] been tested in a test Druid cluster.
   
   <hr>
   
   ### Release Notes
   Users, who would like Druid to report cache metrics, should explicitly add 
`"org.apache.druid.client.cache.CacheMonitor"` to `druid.monitoring.monitors` 
property.

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