KIP-379 — Multiple Consumer Group Management

Accepted Kafka 2.4 ConsumerAdmin

Extends kafka-consumer-groups.sh to accept multiple --group arguments and an --all-groups flag so describe/delete/reset-offsets operations can target several groups or all groups in a single invocation. Running a single consumer group operation required launching a separate JVM per group, making bulk operations on many groups extremely slow and resource-intensive.

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