On Monday I'll be upgrading the database that backs toolforge's Harbor
service. Any attempts to download new container images during this
window will fail.
Existing, running tools will not be affected, and periodically scheduled
jobs should also be fine, but any brand new jobs may fail, depending on
what is or isn't cache at the moment.
The outage should be brief; if you see a cryptic failure around the
scheduled time just take a 10 minute break and try again.
-Andrew