See <https://builds.apache.org/job/karaf-master/6733/display/redirect?page=changes>
- Jenkins build became unstable: karaf-master #6728 Apache Jenkins Server
- Build failed in Jenkins: karaf-master #6729 Apache Jenkins Server
- Build failed in Jenkins: karaf-master #6730 Apache Jenkins Server
- Build failed in Jenkins: karaf-master #... Apache Jenkins Server
- Build failed in Jenkins: karaf-mast... Apache Jenkins Server
- Jenkins build is back to norma... Apache Jenkins Server
