OpenTelemetry custom spans in .NET: seeing what your code decided

It sounds like you're diving into distributed tracing with OpenTelemetry (OTel) for a .NET application that interacts with RabbitMQ. Let's break down and understand each part of your setup:

1. Span Creation and Attributes

When creating spans in OTel, you define the operation being performed along with relevant attributes. For example:

csharp
 
1using var activity = _source.StartActivity("generate forecast", ActivityKind.Server);
2activity.SetTag("city", city);

Here, "generate forecast" is the name of the span representing an operation (like generating a weather forecast), and ActivityKind.Server indicates that this operation is performed by your service. The .SetTag() method adds context-specific attributes to the span.

2. Span Links

For scenarios where you have multiple spans in different traces but need them linked together, such as batch processing or fan-out workflows:

csharp
 
1var links = batch.Select(msg => new ActivityLink(msg.ExtractParentContext()))
2                 .ToArray();
3using var activity = _source.StartActivity("consume forecast batch", 
4                                           ActivityKind.Consumer,
5                                           parentContext: default, 
6                                           links: links);

This code creates a span for consuming

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