An administrator needs to schedule the execution of Systems Manager documents in response to a trigger generated by Zendesk. Which Amazon feature should be used?

Using the EventBridge partner event bus is the most appropriate choice for scheduling the execution of Systems Manager documents in response to triggers generated by Zendesk. This feature enables integration with third-party services like Zendesk to streamline the process of event-driven architecture. By utilizing the partner event bus, the administrator can configure rules that respond to events coming from Zendesk, facilitating actions such as the execution of Systems Manager documents.

This integration allows for real-time reactions to user support tickets and other events from Zendesk, automating responses or processes in AWS as needed. The flexibility of EventBridge in managing events from external systems is crucial for this scenario where scheduling and triggering specific AWS actions based on external inputs is required.

Other options, while relevant in different contexts, do not directly facilitate this kind of integration. The default event bus primarily manages AWS service events, CloudWatch focuses on monitoring and logging rather than integration with third-party events, and CodeDeploy is intended for deployment management rather than triggering document execution based on events.