[VOTE] KIP-1301: Deprecate Yammer-based metrics in `GroupCoordinatorMetrics`

[Nick Guo]

Hi all,

Since there hasn't been any further feedback, I'd like to start a vote
on KIP-1301: https://cwiki.apache.org/confluence/x/Z5U8G

DISCUSS thread:
https://lists.apache.org/thread/zpzc1xb0542wrwp8w1t26wmkcsj40ph8

Thanks,
Nick