# Epic 6: Observability & Production Readiness

## Overview
Enhance observability with full OpenTelemetry integration across all services, add comprehensive error reporting (Sentry), create Grafana dashboards for service monitoring, improve logging with request correlation across services, add rate limiting (primarily at API Gateway), security hardening, and optimize performance for microservices architecture.

**Note:** Observability spans all services - distributed tracing, service-level metrics, and cross-service log correlation.

## Stories

### 6.1 Enhanced Observability
- [Story: 6.1 - Enhanced Observability](./6.1-enhanced-observability.md)
- **Goal:** Enhance observability with full OpenTelemetry integration across all services, comprehensive Prometheus metrics per service, and improved logging with trace correlation.
- **Deliverables:** Complete OpenTelemetry integration, expanded metrics per service, enhanced logging with trace IDs

### 6.2 Error Reporting (Sentry)
- [Story: 6.2 - Error Reporting](./6.2-error-reporting.md)
- **Goal:** Add comprehensive error reporting with Sentry integration.
- **Deliverables:** Sentry integration, error context enhancement

### 6.3 Grafana Dashboards
- [Story: 6.3 - Grafana Dashboards](./6.3-grafana-dashboards.md)
- **Goal:** Create comprehensive Grafana dashboards for monitoring all services.
- **Deliverables:** Grafana dashboard JSON files per service, service-level dashboards, cross-service dashboards, documentation

### 6.4 Rate Limiting
- [Story: 6.4 - Rate Limiting](./6.4-rate-limiting.md)
- **Goal:** Implement rate limiting primarily at API Gateway level, with per-service rate limiting support.
- **Deliverables:** Rate limiting middleware for API Gateway, per-service rate limiting support, Redis-backed rate limiting

**Note:** Rate limiting is primarily implemented in API Gateway (Epic 1, Story 1.8). This story adds per-service rate limiting capabilities.

### 6.5 Security Hardening
- [Story: 6.5 - Security Hardening](./6.5-security-hardening.md)
- **Goal:** Add comprehensive security hardening.
- **Deliverables:** Security headers, input validation, request limits

### 6.6 Performance Optimization
- [Story: 6.6 - Performance Optimization](./6.6-performance-optimization.md)
- **Goal:** Optimize platform performance.
- **Deliverables:** Connection pooling, query optimization, compression, caching

## Deliverables Checklist
- [ ] Full OpenTelemetry integration
- [ ] Sentry error reporting
- [ ] Enhanced logging with correlation
- [ ] Comprehensive Prometheus metrics
- [ ] Grafana dashboards
- [ ] Rate limiting
- [ ] Security hardening
- [ ] Performance optimizations

## Acceptance Criteria
- Distributed traces span all services and are visible in Jaeger
- Errors are reported to Sentry with service context
- Logs include request IDs and trace IDs for correlation across services
- Metrics are exposed per service and scraped by Prometheus
- Rate limiting prevents abuse (primarily at API Gateway)
- Security headers are present on all services
- Performance meets SLA (< 100ms p95 for auth endpoints)
- Service-level dashboards available in Grafana