Amazon EventBridge EventBus allows customers to audit and monitor the actions in their AWS environments through events that are generated by AWS CloudTrail for API calls. Previously, only mutating API calls (for example: Create, Update, or Delete) were available in EventBridge. With support for read-only API events (for example: List, Get or Describe), customers will be able to receive and process the full suite of CloudTrail events from services that are integrated with EventBridge.
Source:: Amazon AWS