AWS CloudWatch Events Launch

AWS CloudWatch Events was launched, providing a stream of system events that describe changes in AWS resources. It allowed users to set up rules to react to these events, triggering Lambda functions, SNS topics, SQS queues, and more.

Significance

This was the foundational technology upon which EventBridge was built. It established the internal event bus pattern within AWS, demonstrating the power of event-driven architectures for intra-AWS service communication. EventBridge later superseded its console and API.