This patch contains the protocol updates needed for KIP-320 as well as some of the basic consumer APIs (e.g. `OffsetAndMetadata` and `ConsumerRecord`). The inter-broker format version has not been changed and the brokers will continue to use the current version.
### Committer Checklist (excluded from commit message) - [ ] Verify design and implementation - [ ] Verify test coverage and CI build status - [ ] Verify documentation (including upgrade notes) [ Full content available at: https://github.com/apache/kafka/pull/5564 ] This message was relayed via gitbox.apache.org for [email protected]
