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  1. Hadoop HDFS
  2. HDFS-15821

Add metrics for in-service datanodes

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      We currently have metrics for live datanodes but some of the datanodes may be in decommissioning state or maintenance state. Adding this metric allows us to know how many nodes are currently in service, where NumInServiceDatanodes = NumLiveDataNodes - NumDecomLiveDataNodes - NumInMaintenanceLiveDataNodes.

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            zehao.chen Zehao Chen
            zehao.chen Zehao Chen
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