Naganarasimha G R created YARN-4129:
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             Summary: Refactor the SystemMetricPublisher in RM to better 
support newer events
                 Key: YARN-4129
                 URL: https://issues.apache.org/jira/browse/YARN-4129
             Project: Hadoop YARN
          Issue Type: Sub-task
          Components: resourcemanager
            Reporter: Naganarasimha G R
            Assignee: Naganarasimha G R


Currently to add new timeline event/ entity in RM side, one has to add a method 
in publisher and a method in handler and create a new event class which looks 
cumbersome and redundant. also further all the events might not be required to 
be published in V1 & V2. So adopting the approach similar to what was adopted 
in YARN-3045(NM side)



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