We can use DiagnosticSourceEventSource to listen to Activity \ traces out of proc. One of the things it does is normalize all tags (KeyValuePair<string, object?>) into strings (KeyValuePair<string, string?>).

Code:

Question: Should we use InvariantCulture when we do this?

Probably also the same question\issue for metrics and logs.

/cc @tarekgh @noahfalk @samsp-msft