zhuxiangyi opened a new pull request #3553:
URL: https://github.com/apache/hadoop/pull/3553
…eOnPerNs metrics
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### Description of PR
[HDFS-16273](https://issues.apache.org/jira/browse/HDFS-16273)
Add the availableHandlerOnPerNs metrics to monitor whether the number of
handlers configured for each NS is reasonable when using
RouterRpcFairnessPolicyController.
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