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Unit 003: Hermes The Bureaucrat - Subunit 003: EventBridge Integration

Objective

Configure EventBridge target to route all events to Hermes Lambda for logging.

Key Technical Decisions

EventBridge Target Configuration

Rule: coderipple-hermes-all-events (already created in Unit 002)
Target: Hermes Lambda function
Input: Full event payload (no transformation)
Retry Policy: 3 attempts with exponential backoff

Lambda Trigger Setup

Event Source: EventBridge custom bus coderipple-events
Event Pattern: All events from coderipple.system
Batch Size: 1 (process events individually)
Maximum Age: 1 hour (discard old events)

Error Handling

Dead Letter Queue: SQS queue for failed Lambda invocations
CloudWatch Alarms: Monitor failed invocations
Retry Logic: Built-in EventBridge retry with backoff

IAM Permissions

EventBridge permission to invoke Hermes Lambda
Lambda execution role with EventBridge receive permissions
Cross-service IAM trust relationships

Testing Strategy

Send test events through Telephonist
Verify Hermes receives and processes events
Check log entries appear in Cabinet S3 bucket
Validate public read access to logs

Dependencies

Hermes Lambda function (Subunit 001)
Cabinet S3 bucket (Subunit 002)
EventBridge Telephonist (Unit 002 - Complete)

Status: Planning Complete

Ready for EventBridge target configuration and end-to-end testing.