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***UNCHECKED*** [jira] [Created] (FLINK-9943) Support TaskManagerMetricQueryServicePaths msg in JobManager Actor

Chuanlei Ni created FLINK-9943:

             Summary: Support TaskManagerMetricQueryServicePaths msg in JobManager Actor
                 Key: FLINK-9943
                 URL: https://issues.apache.org/jira/browse/FLINK-9943
             Project: Flink
          Issue Type: New Feature
          Components: Core
    Affects Versions: 1.5.1, 1.5.0
            Reporter: Chuanlei Ni
             Fix For: 1.6.0

The reasons are as follows
 #  AkkaJobManagerGateway wraps jm actor ref to support such functionality by request RegisteredTaskManagers firstly and request task manager actor to get metric query service path one by one. the procedure above is resource-wasted. It will be more efficient if  we support this functionality in the jm actor
 # we can expose flink metric system directly to external system (such as flink client and the like) to support more features in future. For now, metric system has been exposed partially because Instance can not (and should not) be transfered remotely. This feature will make metrics exposure consistent.

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