[akira2501]

> a few thousands in UNEXPECTED costs, is huge.

It seems like the problem is expecting a fixed infrastructure budget while trying to create ever larger customer engagement. Is it just modern companies that don't realize you can't count your profits until you've got your AWS invoices for that month?

It's a fixed _overhead_ issue, not a fixed _budget_ issue.

[withinboredom]

You should be reserving those instances so it IS a FIXed cost, with very few exceptions.

[akira2501]

There are many AWS services for which you cannot make reservations. You can get better per unit rates by pre-purchasing, but even with instances, network transfer is a per unit factor.

Your only way out is the built in tools to limit service in these cases or to build your own circuit breakers and implement them, or make your usage so small as to not truly require the cloud in the first place.