what is the use case for that?

You could use it to apply a customization to all http client instrumentations or you could use it to differentiate between instrumenters in instrumentations that have multiple instrumenters e.g. armeria has http client and http server instrumenter.

Cc @steverao

👍 It will be better to update documentation and examples in https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/examples together!

@steverao could you help out with updating the example if you believe it is necessary