Azure Functions and AppInsights RequestTelemetry

Question

I'm trying to enhance RequestTelemetry in AppInsights from HttpTrigger Azure Function v3.

Function is initialized with DI and Startup class.

[assembly: FunctionsStartup(typeof(Startup))]
namespace Hager.Example.FunctionApp.FunctionApp
{
    public class Startup : FunctionsStartup
    {
        public override void Configure(IFunctionsHostBuilder builder)
        {
            // No service for repro
        }
    }
}

And my Function

    public class Function1
    {
        private readonly ILogger _logger;

        public Function1(ILogger<Function1> logger)
        {
            _logger = logger;
        }

        [FunctionName("HttpTriggered")]
        public IActionResult Run(
            [HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequestMessage req)
        {
            using var loggerScope = _logger.BeginScope("{InScope1}{InScope2}{InScope3}", Guid.NewGuid(), Guid.NewGuid(), Guid.NewGuid());

            _logger.LogInformation("Started Execution");
            _logger.LogWarning("With a custom property: {CustomProperty}.", Guid.NewGuid());

            Activity.Current?.AddTag("TagStart", Guid.NewGuid());

            if (Activity.Current == null)
            {
                // Always null
                _logger.LogError("No ActivityCurrent {Activity}.", Activity.Current);
                _logger.LogError("ActivityCurrent Tags {Activity}.", Activity.Current?.Tags);
            }

            // Activity.Current.AddTag("Tag2", Guid.NewGuid());  // <- NullException

            _logger.LogInformation("Finished Execution");

            return new NoContentResult();
        }
    }

My project packages:

  <ItemGroup>
    <PackageReference Include="Microsoft.ApplicationInsights" Version="2.17.0" />
    <PackageReference Include="Microsoft.ApplicationInsights.AspNetCore" Version="2.17.0" />
    <PackageReference Include="Microsoft.Azure.Functions.Extensions" Version="1.1.0" />
    <PackageReference Include="Microsoft.NET.Sdk.Functions" Version="3.0.11" />
  </ItemGroup>

Every logger and scopes are working as expected, but object ActivityTag is always null that shouldnt in Azure Functions.

Did I miss something?

Answer 1

Update:

Added Op's solution: by using request.HttpContext?.Features.Get<RequestTelemetry>(), it worked fine.

---

Please uninstall the 2 Application Insights packages: Microsoft.ApplicationInsights and Microsoft.ApplicationInsights.AspNetCore.

By default, Application Insights packages do not collect activity tags. So this should be the reason.

I tested your azure function without installing the above 2 Application Insights packages, it works well. Here is the screenshot of the test result:

Adding my local.settings.json here for your reference, the code is the same as yours:

{
    "IsEncrypted": false,
  "Values": {
    "AzureWebJobsStorage": "xxxx",
    "FUNCTIONS_WORKER_RUNTIME": "dotnet",
    "APPINSIGHTS_INSTRUMENTATIONKEY": "xxx"
  }
}

And if the 2 packages are necessary, maybe you can try add a custom ITelemetryInitializer by following this answer(btw, I didn't test it).