Github user mbode commented on the issue:
https://github.com/apache/flink/pull/3833
@hadronzoo I tried to keep it as general as possible by exporting all
variables available to the metric group as labels. I am not sure if this might
lead to [label
overuse](https://prometheus.io/docs/practices/instrumentation/#do-not-overuse-labels)
at some point, did you ever run into difficulties in that context?
Unfortunately I do not have a lot of experience running Prometheus in a
production environment yet.
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