Concept for passing Activity information down to children without passing to external systems

[mu88]

Hello,

We're making heavy use of .NET's Activity API and its associated building blocks Tag and Baggage for distributd tracing.

Within several of our applications, we face the challenge that we want to pass information from a parent to a child activity (similar to a Baggage), but without passing them to external systems (similar to a Tag).

According to the docs (old and new), there seems to be no such concept, that's why we're manually propagating all Tags from parent to child like this:

List<(string Key, string? Value)>? parentTags = Activity.Current?.Tags.Select(t => (t.Key, t.Value)).ToList();
Activity activity = StartNewChildActivity(name);
parentTags?.ForEach(t => activity.SetTag(t.Key, t.Value));

This works nicely, however, I'm wondering whether .NET itself wouldn't benefit from such a feature. What do you think?