This past week there was an important security release for the Linux kernel. As such, we will be updating and rebooting ALL of our machines ASAP.
This may affect you.
ALL WMF services will experience some downtime of up to 10 or so minutes (including Bugzilla, Gerrit, etc).
== SPECIAL CONSIDERATIONS ==
Some machines are OK for us to just reboot as needed but others are being utilized by others for various tasks (scripts, cronjobs, etc).
If you have jobs running on any machine that you do not have puppetized (ie: it won't just magically start up again after a reboot) you will want to restart your jobs after the reboot.
There is, unfortunately, not set schedule of when any particular machine will be rebooted, but Ops will be giving ~30 minutes notice in the #wikimedia-operations IRC channel on Freenode. You can watch the public Server Admin Log at https://wikitech.wikimedia.org/wiki/Server_admin_log for the warnings and the reboot notice.
Sorry for the invonvenience,
Greg