Observability Three Pillars 1. Logs Discrete events with context. 2. Metrics Numeric measurements over time. 3. Traces Request flow through services. OpenTelemetry Setup Key Metrics RED Method (Request-focused) - R ate: Requests per second - E rrors: Failed requests per second - D uration: Request latency USE Method (Resource-focused) - U tilization: % time busy - S aturation: Queue depth - E rrors: Error count Alerting Good Alerts - Actionable: Something can be done - Urgent: Needs immediate attention - Specific: Clear what's wrong Alert Template Dashboards Essential panels: 1. Request rate…