Exchange/routingKey as independet props in the RabbitMessageSenderContext

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/core/RabbitTemplate.java

@@ -159,6 +159,7 @@ import io.micrometer.observation.ObservationRegistry;
  * @author Mohammad Hewedy
  * @author Alexey Platonov
  * @author Leonardo Ferreira
+ * @author Ngoc Nhan
  *
  * @since 1.0
  */
@@ -2486,7 +2487,7 @@ public class RabbitTemplate extends RabbitAccessor // NOSONAR type line count
 		ObservationRegistry registry = getObservationRegistry();
 		Observation observation = RabbitTemplateObservation.TEMPLATE_OBSERVATION.observation(this.observationConvention,
 				DefaultRabbitTemplateObservationConvention.INSTANCE,
-					() -> new RabbitMessageSenderContext(message, this.beanName, exch + "/" + rKey), registry);
+					() -> new RabbitMessageSenderContext(message, this.beanName, exch, rKey), registry);
 
 		observation.observe(() -> sendToRabbit(channel, exch, rKey, mandatory, message));
 	}

spring-rabbit/src/main/java/org/springframework/amqp/rabbit/support/micrometer/RabbitMessageSenderContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -24,6 +24,7 @@ import io.micrometer.observation.transport.SenderContext;
  * {@link SenderContext} for {@link Message}s.
  *
  * @author Gary Russell
+ * @author Ngoc Nhan
  * @since 3.0
  *
  */
@@ -33,14 +34,40 @@ public class RabbitMessageSenderContext extends SenderContext<Message> {
 
 	private final String destination;
 
+	private final String exchange;
+
+	private final String routingKey;
+
+	@Deprecated(since = "3.2")
 	public RabbitMessageSenderContext(Message message, String beanName, String destination) {
 		super((carrier, key, value) -> message.getMessageProperties().setHeader(key, value));
 		setCarrier(message);
 		this.beanName = beanName;
+		this.exchange = null;
+		this.routingKey = null;
 		this.destination = destination;
 		setRemoteServiceName("RabbitMQ");
 	}
 
+
+	/**
+	 * Create an instance {@code RabbitMessageSenderContext}.
+	 * @param message a message to send
+	 * @param beanName the bean name
+	 * @param exchange the name of the exchange
+	 * @param routingKey the routing key
+	 * @since 3.2
+	 */
+	public RabbitMessageSenderContext(Message message, String beanName, String exchange, String routingKey) {
+		super((carrier, key, value) -> message.getMessageProperties().setHeader(key, value));
+		setCarrier(message);
+		this.beanName = beanName;
+		this.exchange = exchange;
+		this.routingKey = routingKey;
+		this.destination = exchange + "/" + routingKey;
+		setRemoteServiceName("RabbitMQ");
+	}
+
 	public String getBeanName() {
 		return this.beanName;
 	}
@@ -53,4 +80,22 @@ public class RabbitMessageSenderContext extends SenderContext<Message> {
 		return this.destination;
 	}
 
+	/**
+	 * Return the exchange.
+	 * @return the exchange.
+	 * @since 3.2
+	 */
+	public String getExchange() {
+		return this.exchange;
+	}
+
+	/**
+	 * Return the routingKey.
+	 * @return the routingKey.
+	 * @since 3.2
+	 */
+	public String getRoutingKey() {
+		return this.routingKey;
+	}
+
 }

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

@@ -1,5 +1,5 @@
 /*
- * Copyright 2022 the original author or authors.
+ * Copyright 2022-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -66,6 +66,7 @@ import io.micrometer.tracing.test.simple.SimpleTracer;
 
 /**
  * @author Gary Russell
+ * @author Ngoc Nhan
  * @since 3.0
  *
  */
@@ -110,7 +111,9 @@ public class ObservationTests {
 
 			@Override
 			public KeyValues getLowCardinalityKeyValues(RabbitMessageSenderContext context) {
-				return super.getLowCardinalityKeyValues(context).and("foo", "bar");
+				return super.getLowCardinalityKeyValues(context).and("foo", "bar")
+					.and("messaging.destination.name", context.getExchange())
+					.and("messaging.rabbitmq.destination.routing_key", context.getRoutingKey());
 			}
 
 		});
@@ -135,6 +138,8 @@ public class ObservationTests {
 		span = spans.poll();
 		assertThat(span.getTags()).containsEntry("spring.rabbit.template.name", "template");
 		assertThat(span.getTags()).containsEntry("foo", "bar");
+		assertThat(span.getTags()).containsEntry("messaging.destination.name", "");
+		assertThat(span.getTags()).containsEntry("messaging.rabbitmq.destination.routing_key", "observation.testQ1");
 		assertThat(span.getName()).isEqualTo("/observation.testQ1 send");
 		await().until(() -> spans.peekFirst().getTags().size() == 4);
 		span = spans.poll();
@@ -142,10 +147,12 @@ public class ObservationTests {
 				.containsAllEntriesOf(Map.of("spring.rabbit.listener.id", "obs1", "foo", "some foo value", "bar",
 						"some bar value", "baz", "qux"));
 		assertThat(span.getName()).isEqualTo("observation.testQ1 receive");
-		await().until(() -> spans.peekFirst().getTags().size() == 2);
+		await().until(() -> spans.peekFirst().getTags().size() == 4);
 		span = spans.poll();
 		assertThat(span.getTags()).containsEntry("spring.rabbit.template.name", "template");
 		assertThat(span.getTags()).containsEntry("foo", "bar");
+		assertThat(span.getTags()).containsEntry("messaging.destination.name", "");
+		assertThat(span.getTags()).containsEntry("messaging.rabbitmq.destination.routing_key", "observation.testQ2");
 		assertThat(span.getName()).isEqualTo("/observation.testQ2 send");
 		await().until(() -> spans.peekFirst().getTags().size() == 3);
 		span = spans.poll();