Today, AWS CloudFormation StackSets launches event notifications via Amazon EventBridge. You can trigger event-driven actions after creating, updating, or deleting your CloudFormation stack sets. You can achieve this without developing or maintaining custom solutions that periodically poll for changes in your CloudFormation stack sets deployments via CloudFormation APIs. With this launch, you can build your event-driven applications across multiple AWS accounts, Organizational Units (OUs), and Regions with AWS CloudFormation StackSets and Amazon EventBridge.
Source:: Amazon AWS