Github user tzulitai commented on the issue: https://github.com/apache/flink/pull/4187 > I'll not include the other proposed metric in this PR just for the sake of simplicity. I also have some opinions on "offset lag" metric, I think this particular metric is more useful when some external entity perform the monitoring (difference of committed offset vs log head), especially in failure situations. Yes, lets keep that apart from this PR. There is also a JIRA for exactly this feature: https://issues.apache.org/jira/browse/FLINK-6109
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