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• Impacted users: Only those who currently rely on passing a ConsumerRebalanceListener, making a call to consumer's topics subscribe interface, and expecting an updated assignment in the callback are impacted. The number of users who rely on this specific use case is expected to be minimal to zero.
• If we are changing behavior how will we phase out the older behavior?
• If we need special migration tools, describe them here.
• When will we remove the existing behavior?

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