[NOTICE] FirefoxCI Scheduled Downtime with Trees Closed (Sun April 12th)

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Andrew Halberstadt

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Apr 10, 2026, 10:50:17 AM (13 days ago) Apr 10

to sher...@mozilla.com, dev-pl...@mozilla.org, Firefox Dev, firefox-ci

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 on Matrix.

Thanks,

Andrew

Andrew Halberstadt

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Apr 12, 2026, 2:16:36 PM (10 days ago) Apr 12

to dev-pl...@mozilla.org, Firefox Dev, firefox-ci, Sheriffs

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.