Planned Taskcluster Migration Upcoming

[Dustin Mitchell]

*tl;dr:* Taskcluster, the platform supporting Firefox CI, will be moving to
a new hosting environment during the tree-closing window at the end of
September. This is a major change and upgrade to the platform, but may
cause some bumps along the way.

Taskcluster is in the midst of a few migrations [1], and one of those is
moving to a new hosting environment. This has a few advantages:
* Firefox CI will be handled by dedicated teams, separate from the TC team:
* Service operations will be managed by cloudops
* Administration will be managed by releng
* Workers will be managed by relops
* Hosting will be in a more trusted environment (GCP instead of Heroku)
* The services will have a new, faster UI
* Worker provisioning will be faster and more reliable, and cover more
cloud environments
* ..lots of other achievements unlocked by shedding 5+ years of legacy

The downside is that URLs will be changing, likely leaving some dangling
pointers. We've anticipated some of the most common (such as
https://queue.taskcluster.net/ URLs) and are planning workarounds, but
nonetheless anticipate some dead links for a while following the switch.

This work is tracked in bug 1546801 [2]. If you have questions or
concerns, please get in touch with me or anyone on the team, or file a bug
in Taskcluster :: General and we will triage it appropriately.

Dustin

[1]
https://mana.mozilla.org/wiki/pages/viewpage.action?spaceKey=TAS&title=Migrations
[2] https://bugzilla.mozilla.org/show_bug.cgi?id=1546801