See <https://builds.apache.org/job/Log4j%202%202.x/4146/display/redirect?page=changes>
- Jenkins build became unstable: Log4j 2 2.x #4145 Apache Jenkins Server
- Jenkins build is still unstable: Log4j 2 2.x #4... Apache Jenkins Server
- Jenkins build is still unstable: Log4j 2 2.... Apache Jenkins Server
- Jenkins build is back to stable : Log4j... Apache Jenkins Server
