[Engineering] Gerrit downtime this Monday!

[Chad Horohoe]

Hi,

So the time is upon us to finally upgrade Gerrit. I thank everyone in
advance for all of your patience
and good work testing things out for us. The plan is outlined in detail on
Phabricator[0], but I'll give
everyone the short version here.

The downtime will be on Monday, July 25th from 01:00 to 04:00 UTC; that's
Sunday night for those
of us who are US-based. This time was picked based because it's one of our
lowest traffic times
on Gerrit. There's never a *good* time to bring it down, it's always being
used, but this looks like it'll
impact the fewest number of users. I do not anticipate the process actually
taking the full 3 hours,
but I'm giving us a lot of extra time just in case.

Jaime will be on hand to assist with a final DB snapshot of the old version
and possible rollback,
and Daniel Z. is going to assist me with the puppet work. Most of this is
already prepared so the
amount of "change" to do the swap has been kept to a minimum.

Gerrit is a critical service to all developers, so the plan includes a
generous provision to roll back
if things are not operating properly--I'd rather us be on the old version
that works on a Monday
morning than be stuck broken going into the work week.

I'll be sure to send a last minute reminder Sunday night prior to taking
services offline.

Thanks again!

-Chad

[0] https://phabricator.wikimedia.org/T70271#2482308
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