My understanding is that today's outage was not our planned maintenance/upgrade, but rather a provider/host emergency repair. The site host apparently had something go belly-up, and their entire site was down, or at least that portion where OB is located, until their equipment was repaired or replaced.
Mike said that the OB upgrade will come later this week, so we'll have another downtime then.
I would expect that Mike and crew will give us some warning. Today, though, was not their doing, so we got no more warning than they did.