KIP-88 — OffsetFetch Protocol Update

Accepted Kafka 1.0 ConsumerProtocol

KIP-88 extends the `OffsetFetchResponse` to return committed offsets for consumer group members even when the group is in the `Empty` state (no active consumers). Previously the CLI and admin tooling returned an error for empty groups, providing no visibility into committed offsets for groups that had previously consumed and then shut down.

Details