zhuhaifeng created FLINK-4840:

             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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