dotnet-observability Modern observability for .NET applications using OpenTelemetry, structured logging, health checks, and custom metrics. Covers the three pillars of observability (traces, metrics, logs), integration with and , and production-ready health check patterns. Out of scope: DI container mechanics and service lifetimes -- see [skill:dotnet-csharp-dependency-injection]. Async/await patterns -- see [skill:dotnet-csharp-async-patterns]. Testing observability output -- see [skill:dotnet-integration-testing] for verifying telemetry in integration tests. CI/CD pipeline integration for t…