[gcpthrow20221]

This official method is so broken that it's embarrassing that they recommend it. It looks like a solution, but it doesn't work.

The "tiny bit of lag" between usage and billing calculation explodes when there's a lot of usage - in my case, a broken job tried resubmitting itself continuously, and the lag increased to 8 hours and $5000 just when I needed the alert the most. My team's response time was 5 minutes... After the 8 hour GCP lag.

Very similar to this guy's story: https://blog.tomilkieway.com/72k-1/

I had to go back and forth with them on email for weeks, and ultimately threaten them with a draft blog post with a lot of graphs and screenshots of their recommendations for them to cancel the bill.