[jira] [Created] (FLINK-4923) Expose input/output queued buffers and buffer usage as a metric for a Task

[Shang Yuanchun (Jira)]

zhuhaifeng created FLINK-4923:
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             Summary: Expose input/output queued buffers and buffer usage as a metric for a Task
                 Key: FLINK-4923
                 URL: https://issues.apache.org/jira/browse/FLINK-4923
             Project: Flink
          Issue Type: Improvement
            Reporter: zhuhaifeng
            Priority: Minor
             Fix For: 1.2.0


We should expose the following Metrics on the TaskIOMetricGroup:
 1. numInputQueuedBuffers: received buffers of InputGates for a task
 2. numOutputQueuedBuffers: buffers of produced ResultPartitions for a task
 3. InputQueueUsage: usage of InputGates buffer pool for a task
 4. OutputQueueUsage: usage of produced ResultPartitions buffer pool for a task



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