See <https://builds.apache.org/job/karaf-4.0.x/103/changes>
- Jenkins build became unstable: karaf-4.0.x #99 Apache Jenkins Server
- Jenkins build is still unstable: karaf-4.0.x #1... Apache Jenkins Server
- Jenkins build is still unstable: karaf-4.0.... Apache Jenkins Server
- Jenkins build is still unstable: karaf-... Apache Jenkins Server
- Jenkins build is back to stable : k... Apache Jenkins Server