Tracing is broken when AspNetCore integration is used

[lmolkova]

Description

I configure ASP.NET Core integration along with OTel in the following way

var host = new HostBuilder()
    .ConfigureFunctionsWebApplication()
    .ConfigureServices(s => s.AddOpenTelemetry()
        .WithTracing(t => t
                .AddSource("testme")
                .AddAspNetCoreInstrumentation()
                .AddHttpClientInstrumentation())
    .UseFunctionsWorkerDefaults()
    .UseOtlpExporter())
    .Build();

and enable host telemetry with

"telemetryMode": "openTelemetry"

In my function code I create another activity

[Function("Function1")]
public async Task<HttpResponseData> Run([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post")] HttpRequestData req)
{
    using var act = test.StartActivity("THIS IS A TEST");
    _logger.LogInformation("C# HTTP trigger function processed a request.");

    var response = req.CreateResponse(HttpStatusCode.OK);
    response.Headers.Add("Content-Type", "text/plain; charset=utf-8");

    await response.WriteStringAsync("Welcome to Azure Functions!");

    return response;
}

What I get:

I.e.

• GET - incoming HTTP request to host
  • GET - outgoing HTTP request from host to worker
    • TestFuncs GET api/Function1 - incoming request on worker tracked by ASP.NET Core and OTel instrumentation on the worker
  • THIS IS A TEST generated within Function1 execution. It's a child of the incoming request to host - this is the problem

What I expect

• GET - incoming HTTP request to host
  • GET - outgoing HTTP request from host to worker
    • TestFuncs GET api/Function1 - incoming request on worker tracked by ASP.NET Core and OTel instrumentation on the worker
      • THIS IS A TEST generated within Function1 execution. It's a child of the incoming request to worker

Steps to reproduce

• Run aspire dashboard docker run --rm -p 18888:18888 -p 4317:18889 -p 4318:18890 --name aspire-dashboard mcr.microsoft.com/dotnet/nightly/aspire-dashboard:latest
• Run https://github.com/lmolkova/testfuncotel/tree/aspnetcoreint locally

Related to #2733

[jviau]

Are you using AspNetCore integration here?

[lmolkova]

Yes, it's configured in ConfigureFunctionsWebApplication()

[jviau]

This is a known issue we are working on for AspNetCore integration. We have AspNetCore and Functions pipelines both creating their own activity to track this work and those two pipelines are disjointed, causing the correlation issue.

[lmolkova]

Awesome, feel free to close if it's a duplicate

[jviau]

Awesome, feel free to close if it's a duplicate

I am not sure if we have a different issue tracking this. I will leave this open until I find that.