Expose Autoconfigure APIs

[radcortez]

Is your feature request related to a problem? Please describe.
Right now, to configure OpenTelemetry you either build one with OpenTelemetrySdkBuilder or use the auto-configuration one with OpenTelemetrySdkAutoConfiguration.

Describe the solution you'd like
It would be interesting if you could have something in between, where you would use the OpenTelemetrySdkBuilder combined with some of the private apis of the auto-configuration. The motivation is to be able to use all of the autoconfiguration features and configuration properties, but allow to further customize it for third-party libraries.

This could be achieved by turning io.opentelemetry.sdk.autoconfigure.TracerProviderConfiguration#configureTracerProvider into a public API and making it return the builder instead, so you could consume it. It may require exposing some other APIs as well like io.opentelemetry.sdk.autoconfigure.PropagatorConfiguration#configurePropagators.

[anuraaga]

@radcortez We've added an auto configuration builder recently which is meant for this use case, a library that uses autoconfiguration but with full customization of the auto configuration. It's used in the maven extension for example

https://github.com/open-telemetry/opentelemetry-java-contrib/blob/main/maven-extension/src/main/java/io/opentelemetry/maven/OpenTelemetrySdkService.java#L85

Would this work for you?

[radcortez]

@anuraaga sorry, I didn't notice this before. I was only looking into the released versions.

It should help. I'll explore the new API and see if something is missing. Thanks!