Native Otel Tracing Preview2

Native OpenTelemetry tracing for ASP.NET Core

ASP.NET Core now natively adds OpenTelemetry semantic convention attributes to the HTTP server activity, aligning with the OpenTelemetry HTTP server span specification. All required attributes are included by default, matching the metadata previously only available through the OpenTelemetry.Instrumentation.AspNetCore library.

To collect the built-in tracing data, subscribe to the Microsoft.AspNetCore activity source in your OpenTelemetry configuration:

builder.Services.AddOpenTelemetry()
    .WithTracing(tracing => tracing
        .AddSource("Microsoft.AspNetCore")
        .AddConsoleExporter());

No additional instrumentation library (such as OpenTelemetry.Instrumentation.AspNetCore) is needed. The framework now directly populates semantic convention attributes on the request activity, such as http.request.method, url.path, http.response.status_code, and server.address.

If you don't want OpenTelemetry attributes added to the activity, you can turn it off by setting the Microsoft.AspNetCore.Hosting.SuppressActivityOpenTelemetryData AppContext switch to true.