THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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- This change doesn't involve backward incompatible change. Broker will still be able to read existing join group request, and for request < v6 the JoinReason field will be interpreted as "unknown" which shouldn't confuse affect broker's judgement on whether to trigger rebalance by existing conditions.
- User needs to restart both the broker and consumer fleet to enable this new feature. The specific order doesn't matter.
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