The scheduled migration is complete. Please reach out in #Firefox-CI on
Matrix if you're seeing any issues.

Big thanks to Wei Zhou and Matt Boris for taking time on the weekend to get
it done.
-Andrew

On Fri, Apr 10, 2026 at 10:49 AM Andrew Halberstadt <[email protected]>
wrote:

> Hello Firefox Developers,
>
> The Taskcluster and SRE teams will be migrating Firefox CI to new mozcloud
> infrastructure this Sunday, April 12th, resulting in closing production
> Firefox trees. The migration window will be between 09:00 PDT (14:00 UTC)
> and 13:00 PDT (20:00 UTC). Trees will be closed for a subset of this
> window.
>
> try will remain open and there may be minimal impact to it, starting at
> 09:00 PDT (14:00 UTC). If around that time, some tasks seem stuck on
> Treeherder, rerun them after the maintenance is complete. Similarly, if you
> use Firefox CI on a Github repository, you may have to rerun tasks or close
> and reopen pull requests.
>
> If you have any questions or concerns, please reach out to us in
> #firefox-ci <https://matrix.to/#/%23firefox-ci:mozilla.org> on Matrix.
>
> Thanks,
> Andrew
>

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