Addressing PR review

spring-kafka/src/main/java/org/springframework/kafka/listener/KafkaMessageListenerContainer.java

@@ -106,7 +106,6 @@
 import org.springframework.kafka.listener.ContainerProperties.AssignmentCommitOption;
 import org.springframework.kafka.listener.ContainerProperties.EOSMode;
 import org.springframework.kafka.listener.adapter.AsyncRepliesAware;
-import org.springframework.kafka.listener.adapter.MessagingMessageListenerAdapter;
 import org.springframework.kafka.listener.adapter.RecordMessagingMessageListenerAdapter;
 import org.springframework.kafka.support.Acknowledgment;
 import org.springframework.kafka.support.KafkaHeaders;
@@ -2720,7 +2719,7 @@ private RuntimeException doInvokeRecordListener(final ConsumerRecord<K, V> cReco
 			catch (RuntimeException e) {
 				failureTimer(sample, cRecord);
 				recordInterceptAfter(cRecord, e);
-				if (!(this.listener instanceof MessagingMessageListenerAdapter<?, ?>)) {
+				if (!(this.listener instanceof RecordMessagingMessageListenerAdapter<K, V>)) {
 					observation.error(e);
 				}
 				if (this.commonErrorHandler == null) {
@@ -2748,7 +2747,7 @@ private RuntimeException doInvokeRecordListener(final ConsumerRecord<K, V> cReco
 				}
 			}
 			finally {
-				if (!(this.listener instanceof MessagingMessageListenerAdapter<?, ?>)) {
+				if (!(this.listener instanceof RecordMessagingMessageListenerAdapter<K, V>)) {
 					observation.stop();
 				}
 			}

spring-kafka/src/main/java/org/springframework/kafka/listener/adapter/MessagingMessageListenerAdapter.java

@@ -252,6 +252,15 @@ public void setHandlerMethod(HandlerAdapter handlerMethod) {
 		this.handlerMethod = handlerMethod;
 	}
 
+	/**
+	 * Set the {@link ObservationRegistry} to handle observability.
+	 * @param observationRegistry {@link ObservationRegistry} instance.
+	 * @since 3.3.0
+	 */
+	public void setObservationRegistry(ObservationRegistry observationRegistry) {
+		this.observationRegistry = observationRegistry;
+	}
+
 	public boolean isAsyncReplies() {
 		return this.handlerMethod != null && this.handlerMethod.isAsyncReplies();
 	}
@@ -499,24 +508,27 @@ protected void handleResult(Object resultArg, Object request, @Nullable Acknowle
 				invocationResult.messageReturnType() :
 				this.messageReturnType;
 
+		CompletableFuture<?> completableFutureResult;
+
 		if (monoPresent && result instanceof Mono<?> mono) {
 			if (acknowledgment == null || !acknowledgment.isOutOfOrderCommit()) {
 				this.logger.warn("Container 'Acknowledgment' must be async ack for Mono<?> return type " +
 						"(or Kotlin suspend function); otherwise the container will ack the message immediately");
 			}
-			result = mono.toFuture();
+			completableFutureResult = mono.toFuture();
 		}
 		else if (!(result instanceof CompletableFuture<?>)) {
-			result = CompletableFuture.completedFuture(result);
+			completableFutureResult = CompletableFuture.completedFuture(result);
 		}
 		else {
+			completableFutureResult = (CompletableFuture<?>) result;
 			if (acknowledgment == null || !acknowledgment.isOutOfOrderCommit()) {
 				this.logger.warn("Container 'Acknowledgment' must be async ack for Future<?> return type; "
 						+ "otherwise the container will ack the message immediately");
 			}
 		}
 
-		((CompletableFuture<?>) result).whenComplete((r, t) -> {
+		completableFutureResult.whenComplete((r, t) -> {
 			try {
 				if (t == null) {
 					asyncSuccess(r, replyTopic, source, messageReturnType);
@@ -899,10 +911,6 @@ private boolean rawByParameterIsType(Type parameterType, Type type) {
 		return parameterType instanceof ParameterizedType pType && pType.getRawType().equals(type);
 	}
 
-	public void setObservationRegistry(ObservationRegistry observationRegistry) {
-		this.observationRegistry = observationRegistry;
-	}
-
 	/**
 	 * Root object for reply expression evaluation.
 	 * @param request the request.

spring-kafka/src/test/java/org/springframework/kafka/support/micrometer/ObservationTests.java

@@ -398,6 +398,7 @@ void observationErrorExceptionWhenCompletableFutureReturned(@Autowired Exception
 			@Autowired @Qualifier("throwableTemplate") KafkaTemplate<Integer, String> errorTemplate,
 			@Autowired KafkaListenerEndpointRegistry endpointRegistry)
 			throws ExecutionException, InterruptedException, TimeoutException {
+
 		errorTemplate.send(OBSERVATION_ERROR_COMPLETABLE_FUTURE, "testError").get(10, TimeUnit.SECONDS);
 		Deque<SimpleSpan> spans = tracer.getSpans();
 		await().untilAsserted(() -> assertThat(spans).hasSize(2));