Billing Alarm that Measures Credits Spent / Resource Usage

Hi THere

You wont be able to do this with a CloudWatch alarm because the EstimatedCharges metric always includes credits.

You can do it another way by using AWS Budgets. In AWS Budgets, you can set a spend limit and get alerted when you spend is exceeding that limit. You have control over the charge types like excluding Credits, discounts, etc. See https://docs.aws.amazon.com/cost-management/latest/userguide/create-cost-budget.html

Example Budget setup: