Fix ClassCastException caused by overly broad type check in Dubbo tracing integration with Spring WebFlux. (#15371)

Co-authored-by: heliang <heliang1@xiaohongshu.com>
Co-authored-by: xiaosheng <songxiaosheng@apache.org>

Author: 3 people

dubbo-metrics/dubbo-tracing/src/main/java/org/apache/dubbo/tracing/handler/DubboClientTracingObservationHandler.java

@@ -20,7 +20,6 @@
 
 import io.micrometer.observation.Observation;
 import io.micrometer.observation.ObservationHandler;
-import io.micrometer.observation.transport.SenderContext;
 import io.micrometer.tracing.Tracer;
 
 public class DubboClientTracingObservationHandler<T extends DubboClientContext> implements ObservationHandler<T> {
@@ -35,6 +34,6 @@ public void onScopeOpened(T context) {}
 
     @Override
     public boolean supportsContext(Observation.Context context) {
-        return context instanceof SenderContext;
+        return context instanceof DubboClientContext;
     }
 }

dubbo-metrics/dubbo-tracing/src/main/java/org/apache/dubbo/tracing/handler/DubboServerTracingObservationHandler.java

@@ -21,7 +21,6 @@
 
 import io.micrometer.observation.Observation;
 import io.micrometer.observation.ObservationHandler;
-import io.micrometer.observation.transport.ReceiverContext;
 import io.micrometer.tracing.TraceContext;
 import io.micrometer.tracing.Tracer;
 
@@ -46,6 +45,6 @@ public void onScopeOpened(T context) {
 
     @Override
     public boolean supportsContext(Observation.Context context) {
-        return context instanceof ReceiverContext;
+        return context instanceof DubboServerContext;
     }
 }