See <https://builds.apache.org/job/Log4j%202%203.x/103/display/redirect?page=changes>
- Jenkins build became unstable: Log4j 2 3.x #100 Apache Jenkins Server
- Jenkins build is still unstable: Log4j 2 3.x #1... Apache Jenkins Server
- Build failed in Jenkins: Log4j 2 3.x #102 Apache Jenkins Server
- Jenkins build is back to normal : Log4j... Apache Jenkins Server