Ability to customize InstrumenterBuilders in distros #6651
Description
Minimally I'd like to be able to register a global context customizer for all Instrumenters. I don't think I have a preference whether it runs first or after the other context customizers.
I really only need to apply it to http server instrumenters, but don't mind if I need to do that checking inside the context customizer based on presence of http.target attribute.
Wondering if there are other similar use cases and we should generalize somehow, or whether I should just propose a simple global context customizer for now.
It would be nice if it applied to instrumenter-api in the user space as well. In this way, it becomes somewhat similar to a SpanProcessor, as long as people are using the instrumenter-api.