For non-business hour oncall, you usually only need to mitigate with minimum effort. E.g. for a typical overload situation, up sizing the pool or getting an eme

For non-business hour oncall, you usually only need to mitigate with minimum effort. E.g. for a typical overload situation, up sizing the pool or getting an emergency ceiling loan is enough, and you can offload further preventative measures or root cause investigation to the next oncaller when they are in business hour, or wait until next Monday.