Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2226
Actually, we do not even have to move the JobID, if the runtime-specific
parts (the component metric groups) are in `flink-runtime`. That part, I
believe, we should do anyways.
It certainly is nice to have a complete "self-contained" metrics project
with everything. That way, people can actually build their own metrics tooling
using some of the implementation classes, or they can set up self-contained
tests for reporters (without having flink-core) as a test dependency. If it
were not for the `NetUtils`, I would suggest to go for that. The
`Preconditions` are used only for `checkNotNull`, which one can do via
`java.util.Objects.requireNonNull` as well.
On the other side of the argument are the `NetUtils` (one utility function
for port ranges) and making the MetricRegistry use MetricConfig in all places.
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