Datadog.Trace.Annotations doesn't seem to work with AWS Lambda functions

Describe the bug We’re using the Datadog.Trace.Annotations-package to trace a method called by the lambda handler, but, the traces never seems to show up in Datadog. Using the Datadog.Trace-package works as expected.

To Reproduce

[Trace(OperationName = "example.do-heavy-thinking", ResourceName = "Example.Think")] // This trace never shows up
private async Task Think()
{
  using (var scope = Tracer.Instance.StartActive("example.do-heavy-thinking-in-scope")) // This trace does
  {
    scope.Span.ResourceName = "Example.ThinkInScope";
    var random = new Random();
    var thinkingTime = random.Next(50, 1000);

    scope.Span.SetTag("thinking.time", $"{thinkingTime}ms");

    Logger.LogInformation($"Need to think for {thinkingTime}ms");

    await Task.Delay(thinkingTime);
  }
}

The source code for the project can be found here and the function where the method above is invoked here.

Expected behavior That both traces in the above example would be sent to Datadog.

Screenshots (All traces visible in Datadog)

Runtime environment (please complete the following information):

• Instrumentation mode: Automatic (through Serverless Framework plugin)
• Tracer version: 2.30.0 (1.0.0 for Annotations package)
• OS: Amazon Linux 2 (arm64)
• CLR: .NET Core 6.0

Additional context The infrastructure is deployed using Serverless Framework and the serverless-plugin-datadog is used to instrument the Lambda. Using the default values for the configuration of the plugin.

[joeyzhao2018]

Hi @ganhammar, serverless-plugin-datadog v5.33.0 just got released. It should point to dd-trace-dotnet-ARM v8.

I need to take a closer look at the issue why the aws.lambda is missing in example2. I will keep this issue open for now and update here soon

[joeyzhao2018]

Hi @ganhammar, I have deployed and tested using the code your provided. I believe they work in both example and Example2. Thank you again for providing a clean example. I really appreciate it.

As @hghotra has pointed out, there’s some delay between the layer release and the serverless framework plugin release this time. I’ll try to update the plugin tomorrow and update here once done. Meanwhile, if you want to manually fix it. The working layer should be : arn:aws:lambda:<AWS-REGION>:464622532012:layer:dd-trace-dotnet-ARM:8 Note that its dd-trace-dotnet-ARM and the version is 8.