How do I troubleshoot errors in the Amazon EventBridge Scheduler?

To troubleshoot errors in the Amazon EventBridge Scheduler, follow these steps:

• Permissions Check: Start by checking the role you've selected for the scheduler allows the service to assume the role. To do this, go to the EventBridge console, select Schedules, choose the difficult schedule, then go to the Target tab. Check the Execution role and move to the Trust relationships tab. Make sure scheduler.amazonaws.com is set as the Principal and the Action is sts:AssumeRole.
• Target Invocation Failure: If the scheduler ran but the target failed to invoke, use Amazon CloudWatch for information. You can monitor metrics like InvocationAttemptCount and TargetErrorCount. This data can help you pinpoint issues and assess the health of your schedule.
• Dead-Letter Queue (DLQ): Consider setting up a dead-letter queue through Amazon Simple Queue Service (Amazon SQS). This allows you to capture JSON payloads with invocation details, including target responses. The DLQ can provide valuable information about why a target invocation failed, aiding in troubleshooting and resolution.