Hi Colin, That change was proposed and approved via KIP-724:
https://cwiki.apache.org/confluence/display/KAFKA/KIP-724%3A+Drop+support+for+message+formats+v0+and+v1 Ismael On Tue, Nov 21, 2023, 12:21 PM Colin McCabe <cmcc...@apache.org> wrote: > Hi Ismael, > > Can we state somewhere that the message.format.version configuration will > be gone in 4.0? We only will support one message format version (for now, > at least). If we do want more versions later, I don't think we'll want to > configure them via a static config. > > best, > Colin > > > On Tue, Nov 21, 2023, at 12:06, Ismael Juma wrote: > > Hi all, > > > > I would like to start a vote on KIP-896. Please take a look and let us > know > > what you think. > > > > Even though most of the changes in this KIP will be done for Apache Kafka > > 4.0, I would like to introduce a new metric and new request log attribute > > in Apache 3.7 to help users identify usage of deprecated protocol api > > versions. > > > > Link: > > > https://cwiki.apache.org/confluence/display/KAFKA/KIP-896%3A+Remove+old+client+protocol+API+versions+in+Kafka+4.0 > > > > Thanks, > > Ismael >