We now have an outage too. I thought we’d mitigated this after last time by delaying an short expensive task for 10 minutes after start-up (as a new deploy sees the balance reset), but the rate of accrual now seems slower. I’m try to mitigate (again) by delaying it by an hour.
Edit: an hour delay only built up a balance under 3.5 minutes despite utilisation being under 6% for pretty much all the time.