See <https://builds.apache.org/job/zookeeper-master-maven-jdk12/507/display/redirect?page=changes>
- Build failed in Jenkins: zookeeper-master-maven-jdk1... Apache Jenkins Server
- Jenkins build is unstable: zookeeper-master-mav... Apache Jenkins Server
- Build failed in Jenkins: zookeeper-master-m... Apache Jenkins Server
- Build failed in Jenkins: zookeeper-mast... Apache Jenkins Server
- Jenkins build is back to normal : z... Apache Jenkins Server