Hey friends, we are proposing a change on the join group protocol to specify JoinReason for better rebalance performance: https://cwiki.apache.org/confluence/display/KAFKA/KIP-423%3A+Add+JoinReason+to+Consumer+Join+Group+Protocol
although we are in KIP-freeze period, we feel this change has fundamental value to the current protocol and future iteration, feel free to give your valuable feedback when you get time. cc Mayuresh for co-initiating this KIP :) Best, Boyang
