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New Broker Configuration
group.consumer.rebalance.listener.classes (LIST, default: empty)
- A list of fully qualified class names implementing ConsumerGroupRebalanceListener.
- Classes are instantiated and configured by the broker at startup.
- Empty value means callback feature is disabled
Proposed Changes
Add a lightweight broker-side callback path for consumer-group rebalance events, without changing client APIs and without adding high-cardinality metrics.
Server load the group.consumer.rebalance.listener.classes when startuping and trigger the callback interface when rebalance happened.
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