[imtringued]

This is backwards. What you want is to specify resource limits and then have the maximum possible bill calculated for you.

If you want services to turn off if they exceed a threshold then you will need some sort of priority scheme.

[turtleyacht]

A capped resource limit and/or budget does sound easier to manage. Here is your possible max; after that, shut stuff down in this order.

If it were any easier, it would likely be automated as a layer above Infra as Code (IaC). Someone may need to manually check on teams and ensure critical apps are not throttled before less critical ones.