[jira] [Created] (FLINK-20561) Add documentation for `records-lag-max` metric.

[Shang Yuanchun (Jira)]

xiaozilong created FLINK-20561:
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             Summary: Add documentation for `records-lag-max` metric.
                 Key: FLINK-20561
                 URL: https://issues.apache.org/jira/browse/FLINK-20561
             Project: Flink
          Issue Type: Improvement
          Components: Documentation
    Affects Versions: 1.12.0, 1.11.0
            Reporter: xiaozilong


Currently, there are no metric description for kafka topic's lag in flink metrics docs. But this metric was reported in flink actually. So we should add some docs to guide the users to use it.



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