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chrislu
3802106acf
- Implement Heartbeat API (key 12) for consumer group liveness - Implement LeaveGroup API (key 13) for graceful consumer departure - Add comprehensive consumer coordination with state management: * Heartbeat validation with generation and member checks * Rebalance state signaling to consumers via heartbeat responses * Graceful member departure with automatic rebalancing trigger * Leader election when group leader leaves * Group state transitions: stable -> rebalancing -> empty * Subscription topic updates when members leave - Update ApiVersions to advertise 13 APIs total (was 11) - Complete test suite with 12 new test cases covering: * Heartbeat success, rebalance signaling, generation validation * Member departure, leader changes, empty group handling * Error conditions (unknown member, wrong generation, invalid group) * End-to-end coordination workflows * Request parsing and response building - All integration tests pass with updated API count (13 APIs) - E2E tests show '96 bytes' response (increased from 84 bytes) This completes Phase 3 consumer group implementation, providing full distributed consumer coordination compatible with Kafka client libraries. Consumers can now join groups, coordinate partitions, commit offsets, send heartbeats, and leave gracefully with automatic rebalancing.