tomscut opened a new pull request #3778:
URL: https://github.com/apache/hadoop/pull/3778


   JIRA: [HDFS-16376](https://issues.apache.org/jira/browse/HDFS-16376).
   
   In our cluster, we can see logs for nodes that are not chosen. But it's hard 
to see the percentages in each reason from the logs. It is best to add relevant 
metrics to monitor the entire cluster.
   
   
![image](https://user-images.githubusercontent.com/55134131/145429562-88b28729-4486-44fd-8d47-09b6a5c94864.png)
   
   JMX metrics:
   
![block-placement-metrics](https://user-images.githubusercontent.com/55134131/145430372-d0282da3-586e-443a-87b9-7a079f31c675.jpg)
   


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