Kafka Consumer Join-Rate Broker Metrics

[Sayat Satybaldiyev <sa...@gmail.com>]

Dear all,

Kafka consumer has exposed join rate metric from
consumer-coordinator-metrics.  I'm wondering if there a possibility to
expose it on the broker side? As descriptions say join group rebalance is a
signal of unhealthy consumption and it's hard to get this from the client
side.
join-rateThe number of group joins per second. Group joining is the first
phase of the rebalance protocol. A large value indicates that the consumer
group is unstable and will likely be coupled with increased lag
https://docs.confluent.io/current/kafka/monitoring.html