[DISCUSS] KIP-1216: Add rebalance listener metrics for Kafka Streams

[Travis Zhang]

Hi,

I'd like to start a discussion on
KIP-1216:https://cwiki.apache.org/confluence/display/KAFKA/KIP-1216%3A+Add+rebalance+listener+metrics+for+Kafka+Streams

This KIP proposes adding latency metrics for each rebalance callback
to provide operators with the observability needed to effectively
monitor and optimize Kafka Streams applications in production
environments.

Thanks,
Travis