Github user mbode commented on the issue:
https://github.com/apache/flink/pull/4586
I implemented your comments and assembled a [small
setup](https://github.com/mbode/flink-prometheus-example) to test the reporter
again.
It currently clones *master* and build the reporter from there. In order to
test another revision, you can just build
*flink-metrics-prometheus-1.4-SNAPSHOT.jar* locally, put it into the *flink*
subdirectory of the project and add `COPY
flink-metrics-prometheus-1.4-SNAPSHOT.jar /opt/flink/lib` to *flink/Dockerfile*.
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