The Infrastructure Log is the place to go for that transparency—although it’s a retrospective write-up (typically coming out the week after the incident).
The current status page mostly only shows global outages (“[t]his page is for updates about global incidents”). In contrast, the implication above was that this particular one was only affecting a subset of users.
The gap in between is broadly acknowledged to be a flaw in the current setup, and Fly said during one of last year’s outages that they intend to fill it with automatically reported system-wide metrics (including the results of “synthetic alerts”—operations proactively attempted themselves). A person who was having trouble with his own builds could just look at the graphs and see an accumulation of red boxes in iad, say, and then have some confidence that wasn’t his misconfiguration, etc.
It is frustrating not to have that now, though…