[jira] [Created] (FLINK-7611) add metrics to measure the data drop by watermark

[Shang Yuanchun (Jira)]

aitozi created FLINK-7611:
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             Summary: add metrics to measure the data drop by watermark
                 Key: FLINK-7611
                 URL: https://issues.apache.org/jira/browse/FLINK-7611
             Project: Flink
          Issue Type: Improvement
          Components: Metrics
            Reporter: aitozi
            Priority: Minor


when use the window operator with event time, the data come after the window.endtime + allowLatency, the data will be droped, but there is no existed metrics to measure the num of dropped data, and this value will help to set the correct allowLatency



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