[Labs-l] Be warned: unattended-upgrades are coming

[Ryan Lane]

I've just pushed in this change:

https://gerrit.wikimedia.org/r/#/c/25465/

What this means is that Labs instances will automatically apply
security patches in an unattended manner. This means that occasionally
services may restart on your instances when patches are installed.
This change is very much needed, as there's no simple way for us to
manage security patches on instances, and no one bothers to apply them
otherwise.

Unless there's massive outcry about this change, I plan on merging it
in on Monday.

- Ryan