A company has a data processing pipeline that includes several dozen steps. The data processing pipeline needs to send alerts in real time when a…

AWS Step Functions natively integrates with Amazon EventBridge, emitting events for every execution and state transition (e.g., SUCCEEDED, FAILED). This is the most direct and efficient way to monitor the entire pipeline. By creating an EventBridge rule that filters for specific status changes from the target state machine, you can trigger an action, such as publishing a message to an Amazon SNS topic. This provides real-time, centralized notifications for the entire workflow's status without requiring custom code within the pipeline's individual steps.

A. This method is indirect, adds unnecessary components (S3), and only provides a notification when the entire state machine finishes, not for individual step failures in real time.
B. Requiring each Lambda function to write notifications is decentralized, hard to maintain, and does not provide a holistic view of the Step Functions orchestrator itself.
C. AWS CloudTrail is designed for auditing API activity and has inherent latency. It is not the appropriate service for real-time operational monitoring and alerting on state machine status.

1. AWS Step Functions Developer Guide. (2023). Monitoring with Amazon EventBridge. This guide explicitly details the process: "You can create an Amazon EventBridge rule that triggers when a state machine execution changes status... For example, you can create a rule that sends a notification to an Amazon SNS topic when an execution fails." AWS. Retrieved from https://docs.aws.amazon.com/step-functions/latest/dg/cw-events.html

2. Amazon EventBridge User Guide. (2023). Events from AWS services. This document lists AWS Step Functions as a native event source for EventBridge, confirming the direct integration. AWS. Retrieved from https://docs.aws.amazon.com/eventbridge/latest/userguide/events-service-events.html