Merge branch '3.4.x'

Closes gh-45617

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/observation/ObservationAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -40,6 +40,7 @@ import org.springframework.boot.actuate.autoconfigure.tracing.MicrometerTracingA
 import org.springframework.boot.autoconfigure.AutoConfiguration;
 import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBooleanProperty;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingClass;
@@ -159,6 +160,7 @@ public class ObservationAutoConfiguration {
 
 	@Configuration(proxyBeanMethods = false)
 	@ConditionalOnClass(Advice.class)
+	@ConditionalOnBooleanProperty("management.observations.annotations.enabled")
 	static class ObservedAspectConfiguration {
 
 		@Bean

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/observation/ObservationAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2024 the original author or authors.
+ * Copyright 2012-2025 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.
@@ -66,11 +66,13 @@ import static org.mockito.Mockito.mock;
 class ObservationAutoConfigurationTests {
 
 	private final ApplicationContextRunner contextRunner = new ApplicationContextRunner().with(MetricsRun.simple())
+		.withPropertyValues("management.observations.annotations.enabled=true")
 		.withClassLoader(new FilteredClassLoader("io.micrometer.tracing"))
 		.withConfiguration(AutoConfigurations.of(ObservationAutoConfiguration.class));
 
 	private final ApplicationContextRunner tracingContextRunner = new ApplicationContextRunner()
 		.with(MetricsRun.simple())
+		.withPropertyValues("management.observations.annotations.enabled=true")
 		.withUserConfiguration(TracerConfiguration.class)
 		.withConfiguration(AutoConfigurations.of(ObservationAutoConfiguration.class));
 
@@ -141,6 +143,7 @@ class ObservationAutoConfigurationTests {
 	@Test
 	void supplyMeterHandlerAndGroupingWhenMicrometerCoreAndTracingAreOnClassPathButThereIsNoTracer() {
 		new ApplicationContextRunner().with(MetricsRun.simple())
+			.withPropertyValues("management.observations.annotations.enabled=true")
 			.withConfiguration(AutoConfigurations.of(ObservationAutoConfiguration.class))
 			.run((context) -> {
 				ObservationRegistry observationRegistry = context.getBean(ObservationRegistry.class);
@@ -181,6 +184,12 @@ class ObservationAutoConfigurationTests {
 			.run((context) -> assertThat(context).doesNotHaveBean(ObservedAspect.class));
 	}
 
+	@Test
+	void allowsObservedAspectToBeDisabledWithProperty() {
+		this.contextRunner.withPropertyValues("management.observations.annotations.enabled=false")
+			.run((context) -> assertThat(context).doesNotHaveBean(ObservedAspect.class));
+	}
+
 	@Test
 	void allowsObservedAspectToBeCustomized() {
 		this.contextRunner.withUserConfiguration(CustomObservedAspectConfiguration.class)