OpenTelemetry: Support exclusion of non-application URIs if custom Sampler is used

[calohmn]

Description

This refers to the quarkus-opentelemetry extension.

We have opted for using a custom io.opentelemetry.sdk.trace.samplers.Sampler CDI Bean in order to extend the existing sampling logic.
As stated in the documentation, this means that the quarkus.opentelemetry.tracer.suppress-non-application-uris option has no effect, so that the logic for suppressing non-application uris has to be added manually to the custom Sampler.

For applications not using a common /q prefix for the non-application uris, assembling the URIs and applying the path resolution shows to be quite cumbersome.

It would be helpful, if the

List<String> dropNonApplicationUris,
List<String> dropStaticResources

information, given to the TracerRecorder.setupSampler() method is somehow made available for the creation of a custom Sampler.

Implementation ideas

Instead of checking for a Sampler bean, the TracerRecorder.setupSampler() method could check for a bean of a new SamplerFactory class, containing a factory method to which the above mentioned dropNonApplicationUris and dropStaticResources can be supplied by the TracerRecorder.setupSampler() method.

[quarkus-bot]

/cc @radcortez

[mun711]

I'm new to quarkus and didn't check out the code related to this issue yet, but the description seems to be quite detailed.
@calohmn @radcortez
Could I take this issue to investigate?

[radcortez]

Please, go ahead @mun711. Thank you!

[mun711]

@radcortez
added the changes in #26367
Updated the TracerUtil:mapSampler method to search for a sampler bean and use it instead of a baseSampler if found.
Please let me know if that looks good to you or we still want to move this logic to a SamplerFactory.

[calohmn]

FMPOV, this kind of approach of applying the DropNamesSampler and parentBased Sampler on top of the custom sampler also looks ok. The configuration properties documentation would then have to be adapted, dropping the "Providing a custom [...]" part for the quarkus.opentelemetry.tracer.suppress-non-application-uris and quarkus.opentelemetry.tracer.include-static-resources descriptions.