by shigemk2




   // This parameter is required for services that do not support service-linked
    // roles (such as Amazon EMR), and it must specify the ARN of an IAM role that
    // allows Application Auto Scaling to modify the scalable target on your behalf. If
    // the service supports service-linked roles, Application Auto Scaling uses a
    // service-linked role, which it creates if it does not yet exist. For more
    // information, see Application Auto Scaling IAM roles (
    // .