farmmamba created HDFS-17314:
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Summary: Add a metrics to record congestion backoff counts.
Key: HDFS-17314
URL: https://issues.apache.org/jira/browse/HDFS-17314
Project: Hadoop HDFS
Issue Type: Improvement
Components: datanode
Affects Versions: 3.3.6
Reporter: farmmamba
When we enable congestion backoff, we should better know how many times
datanodes have told client backoff. This metrics can help us know better about
congestion function.
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