Ensure that none of your Amazon CloudFormation stacks are in 'Failed' mode for more than 6 hours. A stack is on 'Failed' mode when its status is set to 'CREATE_FAILED' - unsuccessful creation of the stack, 'DELETE_FAILED' - unsuccessful deletion of the stack, 'ROLLBACK_FAILED' - unsuccessful removal of the stack after the creation process failed or 'UPDATE_ROLLBACK_FAILED' - unsuccessful return of the stack to a previous working state after a failed update.
Any failed CloudFormation stacks that are not fixed on time can lead to application downtime, security issues or unexpected costs on your AWS bill. For example, the unsuccessful deletion ("DELETE_FAILED") of one or more stacks can accrue charges for the unused AWS resources provisioned by the stack.
To determine if there are any failed Amazon CloudFormation stacks available in your account, perform the following:
To remove any Amazon CloudFormation stacks available in "Failed" mode for more than 6 hours, perform the following: