Production Monitoring

Error Tracking

• Sentry for application errors
• Structured logging (JSON format)
• Error grouping by root cause
• Alert on new error types

Metrics

• Response time (p50, p95, p99)
• Error rate (4xx, 5xx)
• Throughput (requests/sec)
• CPU/Memory/Disk usage

Alerting Rules

• S1 (Critical): service down, data loss -> immediate
• S2 (High): error rate >5%, response >2s -> 15 min
• S3 (Medium): error rate >1%, disk >80% -> 1 hour
• S4 (Low): deprecation warnings -> daily