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https://issues.apache.org/jira/browse/FLINK-18850?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17203088#comment-17203088
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CloseRiver commented on FLINK-18850:
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[~libenchao],sorry for late reply,recently have time to go back to this issue.

IMHO,we can add metric to RowTimeRangeBoundedPrecedingFunction and 
RowTimeRowsBoundedPrecedingFunction.When `triggeringTs <= lastTriggeringTs` 
then make the metrics inc.

Am I right?WDYT.

> Add late records dropped metric for row time over windows
> ---------------------------------------------------------
>
>                 Key: FLINK-18850
>                 URL: https://issues.apache.org/jira/browse/FLINK-18850
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / Runtime
>            Reporter: Benchao Li
>            Priority: Major
>              Labels: Starter
>
> Currently all the row time over windows in blink planner runtime discards 
> late records silently, it would be good to have a metric about the late 
> records dropping.



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