haiyang1987 commented on code in PR #6735:
URL: https://github.com/apache/hadoop/pull/6735#discussion_r1576147893


##########
hadoop-common-project/hadoop-common/src/site/markdown/Metrics.md:
##########
@@ -326,6 +326,15 @@ Each metrics record contains tags such as HAState and 
Hostname as additional inf
 | `FSN(Read/Write)LockOverallNanosAvgTime` | Average time of holding the lock 
by all operations in nanoseconds |
 | `PendingSPSPaths` | The number of paths to be processed by storage policy 
satisfier |
 
+BlockManager
+-------------
+
+BlockManager metrics indicate each StorageType's usage in the cluster with 
detailed entries.

Review Comment:
   Maybe BlockManager will add other metrics in the future and we can update it 
to a more generic description?
   



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