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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