adoroszlai opened a new pull request, #7392:
URL: https://github.com/apache/ozone/pull/7392

   ## What changes were proposed in this pull request?
   
   `MutableQuantiles` should be stopped when no longer needed, since its 
`scheduledTask` is referenced by a global `ScheduledExecutorService`.
   
   https://issues.apache.org/jira/browse/HDDS-11642
   
   ## How was this patch tested?
   
   Implemented a new Freon test (not part of the PR) that keeps creating and 
closing `RpcClient`.  Confirmed on `master` that `MutableQuantiles` instance 
count is growing:
   
   ```
    num     #instances         #bytes  class name (module)
      3:        677544       32522112  
org.apache.hadoop.metrics2.lib.MutableQuantiles
      3:        935136       44886528  
org.apache.hadoop.metrics2.lib.MutableQuantiles
      3:       1095792       52598016  
org.apache.hadoop.metrics2.lib.MutableQuantiles
   ```
   
   while with the fix it is stable:
   
   ```
    num     #instances         #bytes  class name (module)
    319:            18            864  
org.apache.hadoop.metrics2.lib.MutableQuantiles
    285:            24           1152  
org.apache.hadoop.metrics2.lib.MutableQuantiles
    <no instance>
   ```
   
   CI:
   https://github.com/adoroszlai/ozone/actions/runs/11669242466


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