pnowojski edited a comment on issue #11564: [FLINK-16864][metrics] Add IdleTime metric for task. URL: https://github.com/apache/flink/pull/11564#issuecomment-610803818 Ops, before I merge, can you @wenlong88 squash all of the commits together and can you copy the PR description ``` [FLINK-16864][metrics] Add IdleTime metric for task This pr adds an IdleTime metric which measures idle time of a task including the time cost for mail processor to wait for new mail and the time cost in record writer to waiting a new buffer. 1. when a job can not catch up with the speed of data generating, the vertex which idle time is near to zero is the bottle neck of the job. 2. when a job is not busy, idle time can be used to guide user how much he can scale down the job. ``` to the commit message? If do it from github, you would unfortunately loose authorship of the commits.
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