A hint at why GitHub actions have been unreliable. How many teams are running factories like this on GH infra now?
This is Microsoft scale, I'd be surprised if it made any difference these labs. It's more likely it's plain managerial mishandling of the infra in chasing new profit heights.
I posted in another threat about this: I am seeing a lot of people building their own little bespoke factories. They introduce endless quality gates until it slows development down, and then they add more agents to decide when to run certain actions, and on and on. The end result from what I've seen and personally participated in, is that it often winds up providing negative value in the software development lifecycle. It creates a whole lot of heat, but IMO is not helping the teams utilizing them to ship value any faster than they would with a more limited setup.