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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