[DISCUSS] KIP-748: Add Broker Count Metrics

[Ryan Dielhenn]

Hey kafka-dev,

I created KIP-748 as a proposal to add broker count metrics to the Quorum 
Controller.

https://cwiki.apache.org/confluence/display/KAFKA/KIP-748%3A+Add+Broker+Count+Metrics#KIP748:AddBrokerCountMetrics

Best, 
Ryan Dielhenn