Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2226
Had a quick offline discussion with @zentol and @aljoscha with the outcome:
- Make `flink-metrics-core` strictly the metrics API project for Metrics
and Reporters
- Move all implementations of the metric groups and the MetricRegistry to
`flink-runtime`.
- `flink-core` is actually metric free and depends on the metric API
project only.
Users that want to implement reporters only refer to `flink-metrics-core`.
For tests, a dependency to `flink-runtime` is needed.
We may move further classes to `flink-metric-core` in the future to reduce
test dependencies on `flink-runtime`, but that is an open issue at this point.
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