Dots in topic names in labels are replaced with underscores in consumer metrics 
(it appears it has been that way all the way back since KAFKA-3233), but not in 
broker or producer metrics. We'd like to make visualizations that are 
parameterized by topic name, and show overview information about the whole 
chain of systems that interact with that topic, but this gets a bit tricky 
since we have dots in our topic names. Is there any particular reason that dots 
in topic names are replaced with underscores in consumer metrics labels? If 
not, would it be possible to change this, or would that be considered an 
incompatible change of an API?

Best Regards
Magnus Reftel

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