Github user tillrohrmann commented on the issue:
https://github.com/apache/flink/pull/2220
I rebased on the latest master and introduced a `CharacterFilter`
interface. The `CharacterFilter` allows to filter out invalid characters while
generating the fully qualified metric name.
In order to do this, the `AbstractMetricGroup#generateMetricName` takes a
`CharacterFilter` as argument. The `AbstractReporter` and the
`ScheduledDropwizardReporter` implement this interface to filter out reporter
specific characters.
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