Continuous integration/Data center switch

As part of production upgrades it is common to swap the datacenter of the primary CI server

Hosts
As of Dec 2020 there are two CI hosts:

Services

 * Zuul and https://integration.wikimedia.org/zuul/
 * Jenkins https://integration.wikimedia.org/ci/
 * Website https://integration.wikimedia.org/
 * Docker
 * Docker