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Behavioral compatibility (ceiling raise): raising the ceiling from 500 to 1000 is non-breaking on its own. Brokers that retain their existing setting in [200, 500] behave identically to today. Operators can opt into the higher range explicitly.
Operators must upgrade the controller/broker before relying on the per-group override.
Deprecation
None
Migration
Required operator action before upgrade (only for clusters that explicitly set the broker config below 200):
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