[jira] [Created] (FLINK-4840) Introduce an OperatorSystemMetricGroup

[Shang Yuanchun (Jira)]

zhuhaifeng created FLINK-4840:
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             Summary: Introduce an OperatorSystemMetricGroup
                 Key: FLINK-4840
                 URL: https://issues.apache.org/jira/browse/FLINK-4840
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
            Reporter: zhuhaifeng
            Priority: Minor
             Fix For: 1.2.0


There will introduces the OperatorSystemMetricGroup, which encapsulates the insantiation of TPS meter, lantency/proc_time_cost histograms.
Operator related System metrics are not instantiated directly by the specific Operator, but instead within the OperatorSystemMetricGroup contained in the respective OperatorMetricGroup. They are then later accessed by relevant components(maybe different places), instead of instantiated them identically with static name constants. Other system scope metrics (maybe delay/queue_in/queue_out) can add into the OperatorSystemMetricGroup some later.



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