roleArn

Specify the Amazon Resource Name (ARN) of an Identity and Access Management (IAM) role that allows Application Auto Scaling to modify the scalable target on your behalf. This can be either an IAM service role that Application Auto Scaling can assume to make calls to other AWS resources on your behalf, or a service-linked role for the specified service. For more information, see How Application Auto Scaling works with IAM in the Application Auto Scaling User Guide. To automatically create a service-linked role (recommended), specify the full ARN of the service-linked role in your stack template. To find the exact ARN of the service-linked role for your AWS or custom resource, see the Service-linked roles topic in the Application Auto Scaling User Guide. Look for the ARN in the table at the bottom of the page.