We're seeing pending jobs for Windows 8 machines beyond 24 hours long. Could we please have a pass at the list of Win8 machines out of action? https://secure.pub.build.mozilla.org/builddata/reports/slave_health/slavetype.html?class=test&type=t-w864-ix Callek, once buildduty goes through the list of mia slaves; could we get back some Win10 machines if that's not enough?

I don't think that graph is the right way to determine the age of the backlog; it really only tells you the size of the backlog over time. https://secure.pub.build.mozilla.org/buildapi/pending is a better representation of the age of the backlog. Currently I don't see anything that's older than ~4.5 hours.

From what I recall, we didn't have issues with the number of pending jobs on Windows 8 lately. In bug 1220191, we are working to create a nagios alert for the age of the backlog. Would it be fine to add that bug on the list of dependencies for this one and once we have the alert implemented, to mark this one as resolved?

Yes, I think that's a reasonable approach. Thanks!