Piotr Nowojski created FLINK-35065:
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             Summary: Add numFiredTimers and numFiredTimersPerSecond metrics
                 Key: FLINK-35065
                 URL: https://issues.apache.org/jira/browse/FLINK-35065
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / Metrics, Runtime / Task
    Affects Versions: 1.19.0
            Reporter: Piotr Nowojski
            Assignee: Piotr Nowojski
             Fix For: 1.20.0


Currently there is now way of knowing how many timers are being fired by Flink, 
so it's impossible to distinguish, even using code profiling, if operator is 
firing only a couple of heavy timers per second using ~100% of the CPU time, vs 
firing thousands of timer per seconds.

We could add the following metrics to address this issue:
* numFiredTimers - total number of fired timers per operator
* numFiredTimersPerSecond - per second rate of firing timers per operator



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