ShivsundarR opened a new pull request, #22718:
URL: https://github.com/apache/kafka/pull/22718

   *What*
   https://issues.apache.org/jira/browse/KAFKA-20750
   
   During testing it was observed that the poll idle ratio metric was showing 
NaN even when the fetches were happening successfully. This was a case when 
there were fast polls (sub-millisecond values) leading to a divide by zero 
error.
   PR adds a check and sets the value to 0 in such cases.


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