implementing-observabilitylisted

# Production Observability with OpenTelemetry ## Purpose Implement production-grade observability using OpenTelemetry as the 2025 industry standard. Covers the three pillars (metrics, logs, traces), LGTM stack deployment, and critical log-trace correlation patterns. ## When to Use Use when: - Building production systems requiring visibility into performance and errors - Debugging distributed systems with multiple services - Setting up monitoring, logging, or tracing infrastructure - Implementing structured logging with trace correlation - Configuring alerting rules for production systems Skip if: - Building proof-of-concept without production deployment - System has < 100 requests/day (console logging may suffice) ## The OpenTelemetry Standard (2025) OpenTelemetry is the CNCF graduated project unifying observability: ``` ┌────────────────────────────────────────────────────────┐ │ OpenTelemetry: The Unified Standard │ ├────────────────────────────────────────────────────────┤ │ │ │ ONE SDK for ALL signals: │ │ ├── Metrics (Prometheus-compatible) │ │ ├── Logs (structured, correlated) │ │ ├── Traces (distributed, standardized) │ │ └── Context (propagates across services) │ │ │ │ Language SDKs: │ │ ├──