See <https://builds.apache.org/job/Log4j%202.x/2809/display/redirect?page=changes>
- Jenkins build became unstable: Log4j 2.x #2809 Apache Jenkins Server
- Jenkins build is still unstable: Log4j 2.x #281... Apache Jenkins Server
- Jenkins build is still unstable: Log4j 2.x ... Apache Jenkins Server
- Jenkins build is back to stable : Log4j... Apache Jenkins Server
