sodonnel commented on PR #3781:
URL: https://github.com/apache/ozone/pull/3781#issuecomment-1263959745
HDFS has a metric like this:
```
"DecomNodes" :
"{\"cdh-6x-of-1.cdh-6x-of.root.hwx.site:20002\":{\"xferaddr\":\"172.27.52.133:20002\",\"underReplicatedBlocks\":0,\"decommissionOnlyReplicas\":0,\"underReplicateInOpenFiles\":0}}",
```
It seems to register a MBean instance in the FSNameSystem class. Then it has
a few places it provides these JSON key values in the metrics.
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