docs: @Singleton
      @Primary
      @Requires(classes = JaegerTracer.Builder.class)
      Tracer jaegerTracer(JaegerTracer.Builder tracerBuilder) {
          Tracer tracer = tracerBuilder.build();
          if (!GlobalTracer.isRegistered()) {
              GlobalTracer.register(tracer);
          }
          return tracer;
      }