Github user bowenli86 commented on the issue:
https://github.com/apache/flink/pull/4932
I would suggest another solution - rather than adding another interface
'DelimiterProvider', add `getDelimiter()` which returns '.' as an interface
default method to `MetricReporter`. Any reporter impl classes that don't
override it will use the default delimiter.
BTW, is it better to have `String getDelimiter()` rather than `char
getDelimiter()`? Because 1) Flink has to convert char to string anyway 2) the
former one provides more flexibility in defining delimiters, e.g. as multi
chars
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