Business Metrics with AWS EMF

Instrument API endpoints with business metrics using AWS CloudWatch Embedded Metric Format (EMF). This skill focuses exclusively on domain-specific metrics - AWS AppRunner already provides infrastructure SLO/SLA metrics automatically.

What This Skill Covers

• Business metrics - Domain events (users created, orders placed, payments processed)
• AWS EMF format - Logs that automatically become CloudWatch metrics
• Event subscribers - Metrics emitted via domain event subscribers (not in handlers)
• Type-safe metrics - Concrete metric classes instead of arrays
• SOLID principles - Single Responsibility (subscribers) + Open/Closed (new metric classes)

What This Skill Does NOT Cover

• Infrastructure metrics - Latency, error rates, RPS (AWS AppRunner provides these)
• SLO/SLA metrics - Availability, response times (AWS AppRunner provides these)
• Distributed tracing - Use AWS X-Ray integration instead

When to Use This Skill