You might be interested in https://response.pagerduty.com/, PagerDuty's major incident response process documentation - a good starting point for that red binder.

Having been in the ringmasters seat for major incidents ranging from "relatively routine" to "it's all on fire", and had a ringside seat for a cloud provider outage of comparable magnitude to this one - it still fascinates me how creative solutions can get dreamed up under high pressure, and how effective someone to keep the response calm and _feel like it's in control_ is.