Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2334
True, the `flink-metrics-core` would not need it right now. I added it
because it is somehow part of the public API.
We would need to re-add the annotations dependency - for that, let's check
with the users that requested the "project independence" if they see any
problem with that.
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