Could it work based on deviance from norms? Like a setting where you say, I’m okay with up to two standard deviations from our typical write volume but that’s it?
Or, alternatively, just let me set the size of the volume. Treat it like a hard drive?
In terms of your point about the data at rest, part of the issue is that we get a bill once per month, and that’s probably when we would notice it. Of course there is probably a Cloudwatch alarm or something we could set (I assume) but there’s so many damn services…