Named activity source registration

Use named registration when you want multiple logical activity sources in the same application and resolve them explicitly with keyed services.

Register a named activity source

var services = new ServiceCollection();

services.AddNamedActivitySource("orders");

This registers:

• keyed System.Diagnostics.ActivitySource with the name orders
• keyed IActivitySource<T> that resolves to that same named ActivitySource

Resolve the named activity source in consumers

public class OrderService([FromKeyedServices("orders")] IActivitySource<OrderService> activitySource)
{
}

IActivitySource<T> remains available as a non-keyed service as well, where the underlying source name defaults to the type name.