zhuhaifeng commented on FLINK-4840:

I agree with you, I will modify this jira and add the throughput and latency to 

> Introduce an OperatorSystemMetricGroup
> --------------------------------------
>                 Key: FLINK-4840
>                 URL: https://issues.apache.org/jira/browse/FLINK-4840
>             Project: Flink
>          Issue Type: Improvement
>          Components: Metrics
>            Reporter: zhuhaifeng
>            Assignee: 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.
> TPS: collect records per second(StreamSource), processed elements per 
> second(other operator)
> lantency/proc_time_cost : collect an record time cost(StreamSource), 
> processed an element time cost (other operator)

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