[OTel] Activity is not produced for BasicConsumeAsync on .NET Framework

[Kielek]

Describe the bug

Following code does not generate activity for RabbitMQ.Client.Subscriber activity source.

var consumer = new EventingBasicConsumer(channel);
consumer.Received += (model, ea) =>
{
    var receivedBody = ea.Body.ToArray();
    var receivedMessage = Encoding.UTF8.GetString(receivedBody);
    Console.WriteLine($"Received: {receivedMessage}");
};
channel.BasicConsumeAsync(queue: "hello", autoAck: true, consumer);

Reproduction steps

1. Have an application consuming messages from queue: https://github.com/open-telemetry/opentelemetry-dotnet-instrumentation/pull/3373/files#diff-b8bf5e4638613373d455983b52f680cbac4c13732b860567bda571a9e0b29638R40-R44
2. Have properly defined listener for RabbitMQ.Client.Subscriber
3. If you are using channel.BasicConsumeAsync on .NET Framework 4.6.2, Activity is not generated for channel.BasicConsumeAsync.

It is working fine for .NET6, .NET7 and .NET8. channel.BasicGetAsync generated proper activities.

Expected behavior

Activity RabbitMQ.Client.Subscriber is generated also for channel.BasicConsumeAsync method on .NET Framework.

Additional context

Found while working on introducing RabbitMQ.Client in OpenTelemetry .NET Automatic Instrumentation.

PR: open-telemetry/opentelemetry-dotnet-instrumentation#3373

[michaelklishin]

@Kielek thank you for investigating. Have you filed an issue here just for visibility or you expect that in addition to open-telemetry/opentelemetry-dotnet-instrumentation#3373, this client's OpenTelemetry integration would also have to change?

If it's the latter, feel free to submit a PR :)

[Kielek]

I would consider this as a bug in RabbitMQ.Client.

I cannot promise that I will have time for fixing it here. Linked PR was the easiest way to provide you application/case which is not working.

[lukebakken]

@stebet is there a chance this issue will be fixed by #1528 ?