I don’t have the inside knowledge of this outage but there are some details in here. They say that the job got descheduled due to misconfiguration. This implies

I don’t have the inside knowledge of this outage but there are some details in here. They say that the job got descheduled due to misconfiguration. This implies the job could have been configured to serve through the maintenance event. It also implies there is a class of job which could not have done so. Power must have been at least mostly available, so it implies there was going to be some kind of rolling outage within the data center, which can be tolerated by certain workloads but not by others.