title: Quarkus with Microprofile OpenTracing distributed tracing doesn't work
body: <p>I'm migrating Thorntail (2.4.0.Final) to Quarkus (1.11.1.Final).
  During test phase we have noticed that distributed tracing is not working.
  Tracing works (single component traces) but uber-trace-id is not passed with rest request header, so next microservice (recipient of rest request) is generating Trace from zero without span info.</p>
  <p>In Thorntail it was done just by configuration on ClientBuilder</p>
  <pre><code>import org.eclipse.microprofile.opentracing.ClientTracingRegistrar;
  import javax.ws.rs.client.ClientBuilder;
  ...
  ClientBuilder clientBuilder = ClientBuilder.newBuilder();
  ...
  ClientTracingRegistrar.configure(clientBuilder);
  </code></pre>
  <p>Comparing both I have noticed that with Thorntail there was ClientTracingRegistrarProvider available</p>
  <pre><code>public class ResteasyClientTracingRegistrarProvider implements ClientTracingRegistrarProvider {
      public ResteasyClientTracingRegistrarProvider() {
      }
  
      public ClientBuilder configure(ClientBuilder clientBuilder) {
          return this.configure(clientBuilder, Executors.newFixedThreadPool(10));
      }
  
      public ClientBuilder configure(ClientBuilder clientBuilder, ExecutorService executorService) {
          ResteasyClientBuilder resteasyClientBuilder = (ResteasyClientBuilder)clientBuilder;
          Tracer tracer = (Tracer)CDI.current().select(Tracer.class, new Annotation[0]).get();
          return (ClientBuilder)resteasyClientBuilder.executorService(new TracedExecutorService(executorService, tracer)).register((new Builder(tracer)).withTraceSerialization(false).build());
      }
  }
  </code></pre>
  <p>with all wildfly related configuration like file
  META-INF/services/org.eclipse.microprofile.opentracing.ClientTracingRegistrarProvider
  with provider path
  org.wildfly.swarm.mpopentracing.deployment.ResteasyClientTracingRegistrarProvider</p>
  <p>In Quarkus we are building rest client in the same way and there is no such provider.
  Is anybody aware what we need to change to have this distributed tracing feature?</p>
  <p>Additional info:
  we are building rest client with jaxrs API (javax.ws.rs)
  and building app with dependencies:</p>
  <pre><code>        &lt;dependency&gt;
              &lt;groupId&gt;io.quarkus&lt;/groupId&gt;
              &lt;artifactId&gt;quarkus-resteasy&lt;/artifactId&gt;
          &lt;/dependency&gt;
          &lt;dependency&gt;
              &lt;groupId&gt;io.quarkus&lt;/groupId&gt;
              &lt;artifactId&gt;quarkus-smallrye-opentracing&lt;/artifactId&gt;
          &lt;/dependency&gt;
  
  </code></pre>
  <p>Thanks in advance for all suggestions and help.</p>