It seems hard to believe that a one-hour delay on such a counter is impossible to achieve, and one hour would reduce the risk from "catastrophic" to "serious problem" in most cases.

Also, if implementing a cap is a desired feature that justifies trade-offs to be made, then it is psosible to translate the budget cap (in terms of money) back into service-specific caps that are easier to keep consistent. Such as "autoscale this set of VMs" and "my budget cap is $1000/hour", with the VM type being priced at $10/hour, translated to "autoscale to at most 100 instances". That would need dev work (i.e. this feature being considered important) and would not respect the budget cap in a cross-service way automatically, but still it is another piece in the puzzle.