elek opened a new pull request #1505: HDDS-2166. Some RPC metrics are missing from SCM prometheus endpoint URL: https://github.com/apache/hadoop/pull/1505 In Hadoop metrics it's possible to register multiple metrics with the same name but with different tags. For example each RpcServere has an own metrics instance in SCM. {code} "name" : "Hadoop:service=StorageContainerManager,name=RpcActivityForPort9860", "name" : "Hadoop:service=StorageContainerManager,name=RpcActivityForPort9863", {code} They are converted by PrometheusSink to a prometheus metric line with proper name and tags. For example: {code} rpc_rpc_queue_time60s_num_ops{port="9860",servername="StorageContainerLocationProtocolService",context="rpc",hostname="72736061cbc5"} 0 {code} The PrometheusSink uses a Map to cache all the recent values but unfortunately the key contains only the name (rpc_rpc_queue_time60s_num_ops in our example) but not the tags (port=...) For this reason if there are multiple metrics with the same name, only the first one will be displayed. As a result in SCM only the metrics of the first RPC server can be exported to the prometheus endpoint. See: https://issues.apache.org/jira/browse/HDDS-2166
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