Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/2226
Having `MetricsConfig` extend `Properties` mitigates the issue to some
extend.
I know I am very adamant on not having an extra config object. It's because
I heard it a bunch of times that the plethora of config types annoy developers
(in general, not Flink specific) when every tool/system/library introduces
their own config types. So it would be nice if Flink did not introduce more
than one custom config type.
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