Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2517
Currently, when a metric is registered the reporter also receives the group
it was registered on as an argument. Since this group is shared by all
reporters we can't do any tricks in them to be reporter specific.
Instead, we could create a single reporter specific AbstractMetricGroup
that is aware of the reporter index, which contains a AbstractMetricGroup
reference. All calls to methods are forwarded to the reference, with the index
being supplied when necessary. This reference is set when a metric is
registered. Does that make sense?
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