See <https://ci-builds.apache.org/job/Ant/job/Ant-Build-Matrix-master-Linux/OS=ubuntu,jdk=jdk_15_latest/23/display/redirect>
- Jenkins build is unstable: Ant » Ant-Build-Matrix-ma... Apache Jenkins Server
- Jenkins build is still unstable: Ant » Ant-Buil... Apache Jenkins Server
- Jenkins build is back to stable : Ant » Ant... Apache Jenkins Server
