See <https://builds.apache.org/job/zookeeper-master-maven-jdk12/281/display/redirect>
- Build failed in Jenkins: zookeeper-master-maven-jdk1... Apache Jenkins Server
- Build failed in Jenkins: zookeeper-master-maven... Apache Jenkins Server
- Jenkins build is unstable: zookeeper-master... Apache Jenkins Server
- Build failed in Jenkins: zookeeper-mast... Apache Jenkins Server
- Jenkins build is back to normal : z... Apache Jenkins Server
