CloudFormation Announces Drift Detection Support in StackSets

You can easily get started in the CloudFormation StackSets console by selecting a StackSet and choosing ‘Detect drift’ in the ‘Actions’ drop-down menu. Drift detection in StackSets also exposes new APIs that are available via the AWS SDKs and the AWS CLI. For more details, please refer to our API reference and our documentation. This functionality is available in the following regions: US East (N. Virginia), US East (Ohio), US West (N. California), US West (Oregon), Canada (Central), Asia Pacific (Mumbai), Asia Pacific (Seoul), Asia Pacific (Singapore), Asia Pacific (Sydney), Asia Pacific (Tokyo), EU (Frankfurt), EU (Ireland), EU (London), EU (Paris), and South America (São Paulo). 



https://aws.amazon.com/about-aws/whats-new/2019/11/cloudformation-announces-drift-detection-support-in-stackSets/