Not seeing any GraphQL telemetry with UseTelemetry

[jeffw-wherethebitsroam]

Summary

I am probably missing something simple here, but I can't get telemetry working with graphql.

Relevant information

Service configuration:

    services
        .AddOpenTelemetry()
        .ConfigureResource(resource => resource.AddService("API"))
        .WithTracing(tracing => tracing
            .AddAspNetCoreInstrumentation()
            .AddHttpClientInstrumentation()
            .AddSqlClientInstrumentation()
            .AddConsoleExporter());

// later

        services.AddSingleton<IGraphQLExceptionHandler, ExceptionHandler>();
        services.AddGraphQL(builder => builder
            .AddSchema<MySchema>()
            .ConfigureExecutionOptions(options =>
            {
                var requestServices = options.RequestServices ?? throw new Exception("Missing RequestServices");
                var handler = requestServices.GetRequiredService<IGraphQLExceptionHandler>();
                options.UnhandledExceptionDelegate = ctx => handler.HandleException(ctx);
            })
            .AddSystemTextJson()
            .AddDataLoader()
            .AddGraphTypes(typeof(MySchema).Assembly)
            .UseTelemetry()
        );

I see http and sql traces, but nothing graphql. I'm not sure where to start debugging this!

Environment (if relevant)

dotnet 8.0

[gao-artur]

Do you see the AspNetCore span? What's the Activity.Current value when you access it in the field resolver? If not null, what are the values of the DisplayName, IsAllDataRequested, and ActivityTraceFlags properties?

[gao-artur]

Oh, I see now. You need to register the activity source name

    services
        .AddOpenTelemetry()
        .ConfigureResource(resource => resource.AddService("API"))
        .WithTracing(tracing => tracing
            .AddAspNetCoreInstrumentation()
            .AddHttpClientInstrumentation()
            .AddSqlClientInstrumentation()
            .AddSource(GraphQLTelemetryProvider.SourceName) // <= this line!
            .AddConsoleExporter());

[jeffw-wherethebitsroam]

Thanks! That fixed it. But I couldn't find documentation for this anywhere!