Atlantis: Feature: add cost warnings when Atlantis detect usage of expensive instance types

[cket]

Atlantis is great for self service infrastructure and lets users launch new EC2 instances & ASG. However some instance types are very expensive & many times a lower cost instance will work fine. On the other hand, there are valid use cases for these instance types so we don't want to ban them outright.

Having Atlantis detect & warn on usage of some of these expensive instances seems like a nice way to stay cost-conscious while letting developers move fast.

[mveitas]

This seems like a better option for something like tflint that could be run as a command

[lkysow]

Hi @cket. I think this is going to be out of scope for Atlantis. Do you think making this a custom command like @mveitas suggests above would work?

[cket]

Sure, that makes sense to me. Thanks for the suggestion!

[lkysow]

Feel free to comment here with a link to the command repo when you've built it and then others can use it!

[alikhajeh1]

I just wanted to put https://github.com/aliscott/infracost on your radar in case it helps. We made a GitHub action for it too: https://github.com/marketplace/actions/run-infracost