Github user GJL commented on the issue:
https://github.com/apache/flink/pull/4757
@bowenli86 I am about to finish my work on
[FLINK-7718](https://issues.apache.org/jira/browse/FLINK-7718), which is quite
similar to your ticket. Unfortunately I missed that you are also migrating an
implementation of `AbstractMetricsHandler`. My PR (#5055) is ready to merge so
I suggest that we try to rebase your changes on top of mine as soon as it is in
the master. If you don't have time to do that, I can take it over. What do you
think?
---
