[GitHub] [ozone] neils-dev commented on pull request #3781: HDDS-2642. Expose decommission / maintenance metrics via JMX

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neils-dev commented on PR #3781:
URL: https://github.com/apache/ozone/pull/3781#issuecomment-1281536891

   JMX and prom metrics collected for monitoring decommissioning and 
maintenance mode workflow updated to included collecting metrics by host.  
Examples of metrics captured follow.  
   JMX sample with hosts _**ozone-datanode-3.ozone_default**_ and 
_**ozone-datanode-1.ozone_default**_ :
   ```
       "modelerType" : "NodeDecommissionMetrics",
       "tag.Context" : "ozone",
       "tag.Hostname" : "e8772c7d7c4c",
       "TrackedDecommissioningMaintenanceNodesTotal" : 1,
       "TrackedRecommissionNodesTotal" : 0,
       "TrackedPipelinesWaitingToCloseTotal" : 2,
       "TrackedContainersUnderReplicatedTotal" : 0,
       "TrackedContainersUnhealthyTotal" : 0,
       "TrackedContainersSufficientlyReplicatedTotal" : 0,
       "TrackedContainersSufficientlyReplicatedTotal" : 0,
       "TrackedContainersUnderReplicatedTotal" : 0,
       "TrackedContainersUnhealthyTotal" : 0,
       "TrackedDecommissioningMaintenanceNodesTotal" : 1,
       "TrackedPipelinesWaitingToCloseTotal" : 2,
       "TrackedRecommissionNodesTotal" : 0,
       "trackedPipelinesWaitingToClose-ozone-datanode-3.ozone_default" : 0,
       "trackedSufficientlyReplicated-ozone-datanode-3.ozone_default" : 0,
       "trackedUnderReplicated-ozone-datanode-3.ozone_default" : 0,
       "trackedUnhealthyContainers-ozone-datanode-3.ozone_default" : 0,
       "trackedPipelinesWaitingToClose-ozone-datanode-1.ozone_default" : 2
     }, { 
   ```
   
   And, prom endpoint capturing decommissioning datanodes 3 and 1 in captured 
image:
   
![prom_decommission_monitor_scale](https://user-images.githubusercontent.com/81126310/196290199-c9ab6aa1-d4d8-4309-913d-f0b442135cc2.png)
   


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