APIs, and SDKs. Use it to instrument, generate, collect, and export telemetry data (metrics, logs, and traces) to help you analyze your software’s performance and behavior. - ASP.NET Core/.NET emits telemetry data consumeable by OpenTelemetry - Use System.Diagnostics.Activity to create custom traces - Use System.Diagnostics.Meter to create custom metrics Cloud-Native ASP.NET Core Services fit machen Observability 10