[jira] [Created] (FLINK-4202) Add JM metric which shows the restart duration

[Shang Yuanchun (Jira)]

Till Rohrmann created FLINK-4202:
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             Summary: Add JM metric which shows the restart duration
                 Key: FLINK-4202
                 URL: https://issues.apache.org/jira/browse/FLINK-4202
             Project: Flink
          Issue Type: Improvement
          Components: Distributed Coordination
    Affects Versions: 1.1.0
            Reporter: Till Rohrmann
            Assignee: Till Rohrmann
             Fix For: 1.1.0


It is convenient for users to have a metric which tells you how long the restarting of a job has taken.

I propose a to introduce a {{Gauge}} which returns the time between {{JobStatus.RESTARTING}} and {{JobStatus.RUNNING}}. If the job was not restarted (initial run), then this metric will return {{-1}}.



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