On this coming Monday, Nov 22, at 22:00 UTC (14:00 PST) we are planning to migrate the production Phabricator instance from old hardware to newer hardware. (phab1001 -> phab1004)
We are reserving a 30 minute window to switch over but expect actual user impact to be much shorter.
You should not notice much, it's not a Phabricator version or distro upgrade, it's all about moving away from old hardware.
We picked a time slot where we expect user traffic to be low.
note: The git-ssh.wikimedia.org service (git over ssh for repos on Phabricator) has been disabled a while ago already already and has been deprecated. Please use Gitlab or Gerrit for all your repo needs.
https://phabricator.wikimedia.org/T280597