In WildFly 33, after configuring OpenTelemetry, both Spans created explicitly using 
io.opentelemetry.api.trace.Tracer and spans created with the io.opentelemetry.instrumentation.annotations.WithSpan annotation caused spans to be forwarded to the collector.
 
However, after upgrading to WildFly 34 only the explicit spans are forwarded.
 
Changes made from 33 to 34:
 
Version updated from 33.0.2.Final to 34.0.0.Final
Still using BOM wildfly-ee-with-tools
Switched BOM from wildfly-microprofile to wildfly-expansion
 
In both versions, adding the annotations dependency directly as it is not available in a provided scope:
 
         <dependency>
             <groupId>io.opentelemetry.instrumentation</groupId>
             <artifactId>opentelemetry-instrumentation-annotations</artifactId>
             <version>2.8.0</version>
         </dependency>
 
Example usage:
 
    @ApplicationScoped
    public class GreetingRepository {

            @Inject private EntityManager em;

            @WithSpan
            public Greeting findByLocation(String location)

   
}