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For this KIP, we like to propose the fix to make the metrics to report the real latency. 

It would be very helpful if we can also monitor the latency between each pair of brokers and detect any networking device grey failures.  This KIP makes it possible to monitor any latency change between brokers.

Public Interfaces

Add waitTimeMs in FetchResponse, and bump the FetchResponse and FetchRequest protocol version. 

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