Hello,
For some nasty reason the Wikimedia Jenkins had to be restarted a few minutes ago. It is currently busy reloading the configuration and restarting, should be fully back up around 5:20pm UTC.
Meanwhile, jenkins-bot will whine in Gerrit that jobs have been LOST. This is because it cant reach Jenkins to build the jobs and consider they are not existent (ie lost).
Whenever Jenkins is back up, the jobs will have to be retriggered by submitting a new patchset (for example fixing a typo in the commit summaries of changes affected).
Sorry for the inconvenience.