Further reading
- CloudFormation linter: https://github.com/aws-cloudformation/cfn-python-lint
- Importing resources in the stack: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/resource-import.html
- Working with drifts: https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-stack-drift.html