Github user zentol commented on the issue:
https://github.com/apache/flink/pull/2285
The usage of the `DelagatingConfiguration` poses a few problems in regards
to #2226. After that PR reporters will no longer work on a `Configuration` but
instead a `MetricConfig` object that extends `Properties`. For this to work
certain key have to be extracted from the `Configuration` and passes into the
`MetricConfig`. Naturally, for this to work you must know the names of all keys
required. This doesn't work for arbitrary user-defined settings though. We have
to revert back to a `metrics.reporter.<name>.arguments` property.
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