Status of staging buildmaster

@gkistanova The staging buildmaster has been down since September 15th. Is this an oversight? I wonder because this has happened several times lately, and usually the production one has remained online.

Btw., previously announcements regarding the builders were posted to llvm-dev, which seem to be gone now. Maybe it would be good to have a new tag for builder-related announcements and issues?

Thanks.
Rainer