The 2.1.0 version is closed for major changes after alpha release so it would have to go in 2.2.0.
@teleivo, I’d verify if the bridge mentioned at https://logging.apache.org/log4j/2.0/log4j-1.2-api/ works for us since as I understand it doesn’t require config changes.
It would be great to use this opportunity to rethink how modules configure logging. Including log4j.xml is a bad practice as it may mess up/overwrite the global configuration and it introduces a dependency on the log4j version as we just learned the hard way…