Move WebFlux observation auto-config into spring-boot-webflux

See gh-46138

spring-boot-project/spring-boot-actuator-autoconfigure-all/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -16,7 +16,6 @@ org.springframework.boot.actuate.autoconfigure.management.ThreadDumpEndpointAuto
 org.springframework.boot.actuate.autoconfigure.metrics.data.RepositoryMetricsAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.metrics.task.TaskExecutorMetricsAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.observability.ObservabilityAutoConfiguration
-org.springframework.boot.actuate.autoconfigure.observation.web.reactive.WebFluxObservationAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.observation.web.servlet.WebMvcObservationAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.sbom.SbomEndpointAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.scheduling.ScheduledTasksEndpointAutoConfiguration

spring-boot-project/spring-boot-actuator-autoconfigure-all/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/test/MetricsIntegrationTests.java

@@ -35,7 +35,6 @@ import org.junit.jupiter.api.Test;
 
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.boot.actuate.autoconfigure.observability.ObservabilityAutoConfiguration;
-import org.springframework.boot.actuate.autoconfigure.observation.web.reactive.WebFluxObservationAutoConfiguration;
 import org.springframework.boot.actuate.autoconfigure.observation.web.servlet.WebMvcObservationAutoConfiguration;
 import org.springframework.boot.autoconfigure.ImportAutoConfiguration;
 import org.springframework.boot.http.converter.autoconfigure.HttpMessageConvertersAutoConfiguration;
@@ -55,6 +54,7 @@ import org.springframework.boot.test.context.SpringBootTest.WebEnvironment;
 import org.springframework.boot.tomcat.autoconfigure.servlet.TomcatServletWebServerAutoConfiguration;
 import org.springframework.boot.web.server.test.client.TestRestTemplate;
 import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.boot.webflux.observation.autoconfigure.WebFluxObservationAutoConfiguration;
 import org.springframework.boot.webmvc.autoconfigure.DispatcherServletAutoConfiguration;
 import org.springframework.boot.webmvc.autoconfigure.WebMvcAutoConfiguration;
 import org.springframework.context.ApplicationContext;

spring-boot-project/spring-boot-webflux/build.gradle

@@ -35,6 +35,8 @@ dependencies {
 
 	optional(project(":spring-boot-project:spring-boot-actuator"))
 	optional(project(":spring-boot-project:spring-boot-autoconfigure"))
+	optional(project(":spring-boot-project:spring-boot-metrics"))
+	optional(project(":spring-boot-project:spring-boot-micrometer-observation"))
 	optional(project(":spring-boot-project:spring-boot-validation"))
 
 	testFixturesApi(testFixtures(project(":spring-boot-project:spring-boot-actuator")))

spring-boot-project/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/observation/autoconfigure/WebFluxObservationAutoConfiguration.java

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.actuate.autoconfigure.observation.web.reactive;
+package org.springframework.boot.webflux.observation.autoconfigure;
 
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.config.MeterFilter;
@@ -30,8 +30,6 @@ import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplicat
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.boot.metrics.OnlyOnceLoggingDenyMeterFilter;
 import org.springframework.boot.metrics.autoconfigure.MetricsProperties;
-import org.springframework.boot.metrics.autoconfigure.export.simple.SimpleMetricsExportAutoConfiguration;
-import org.springframework.boot.micrometer.observation.autoconfigure.ObservationAutoConfiguration;
 import org.springframework.boot.micrometer.observation.autoconfigure.ObservationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.core.annotation.Order;
@@ -46,9 +44,11 @@ import org.springframework.http.server.reactive.observation.ServerRequestObserva
  * @author Jon Schneider
  * @author Dmytro Nosan
  * @author Moritz Halbritter
- * @since 3.0.0
+ * @since 4.0.0
  */
-@AutoConfiguration(after = { SimpleMetricsExportAutoConfiguration.class, ObservationAutoConfiguration.class })
+@AutoConfiguration(afterName = {
+		"org.springframework.boot.metrics.autoconfigure.export.simple.SimpleMetricsExportAutoConfiguration",
+		"org.springframework.boot.micrometer.observation.autoconfigure.ObservationAutoConfiguration" })
 @ConditionalOnClass({ Observation.class, MeterRegistry.class })
 @ConditionalOnBean({ ObservationRegistry.class, MeterRegistry.class })
 @ConditionalOnWebApplication(type = ConditionalOnWebApplication.Type.REACTIVE)

spring-boot-project/spring-boot-webflux/src/main/java/org/springframework/boot/webflux/observation/autoconfigure/package-info.java

@@ -17,4 +17,4 @@
 /**
  * Auto-configuration for WebFlux actuator observations.
  */
-package org.springframework.boot.actuate.autoconfigure.observation.web.reactive;
+package org.springframework.boot.webflux.observation.autoconfigure;

spring-boot-project/spring-boot-webflux/src/main/resources/META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports

@@ -3,3 +3,4 @@ org.springframework.boot.webflux.autoconfigure.ReactiveMultipartAutoConfiguratio
 org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfiguration
 org.springframework.boot.webflux.autoconfigure.WebSessionIdResolverAutoConfiguration
 org.springframework.boot.webflux.autoconfigure.error.ErrorWebFluxAutoConfiguration
+org.springframework.boot.webflux.observation.autoconfigure.WebFluxObservationAutoConfiguration

spring-boot-project/spring-boot-webflux/src/test/java/org/springframework/boot/webflux/observation/autoconfigure/WebFluxObservationAutoConfigurationTests.java

@@ -14,17 +14,16 @@
  * limitations under the License.
  */
 
-package org.springframework.boot.actuate.autoconfigure.observation.web.reactive;
+package org.springframework.boot.webflux.observation.autoconfigure;
 
 import java.time.Duration;
 import java.time.temporal.ChronoUnit;
 
 import io.micrometer.core.instrument.MeterRegistry;
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.extension.ExtendWith;
 
-import org.springframework.boot.actuate.autoconfigure.metrics.test.MetricsRun;
-import org.springframework.boot.actuate.autoconfigure.metrics.web.TestController;
 import org.springframework.boot.autoconfigure.AutoConfigurations;
 import org.springframework.boot.metrics.autoconfigure.MetricsAutoConfiguration;
 import org.springframework.boot.micrometer.observation.autoconfigure.ObservationAutoConfiguration;
@@ -35,6 +34,8 @@ import org.springframework.boot.test.system.OutputCaptureExtension;
 import org.springframework.boot.webflux.autoconfigure.WebFluxAutoConfiguration;
 import org.springframework.http.server.reactive.observation.DefaultServerRequestObservationConvention;
 import org.springframework.http.server.reactive.observation.ServerRequestObservationConvention;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.mock;
@@ -51,7 +52,7 @@ import static org.mockito.Mockito.mock;
 class WebFluxObservationAutoConfigurationTests {
 
 	private final ReactiveWebApplicationContextRunner contextRunner = new ReactiveWebApplicationContextRunner()
-		.with(MetricsRun.simple())
+		.withBean(SimpleMeterRegistry.class)
 		.withConfiguration(
 				AutoConfigurations.of(ObservationAutoConfiguration.class, WebFluxObservationAutoConfiguration.class));
 
@@ -130,4 +131,24 @@ class WebFluxObservationAutoConfigurationTests {
 		return meterRegistry;
 	}
 
+	@RestController
+	static class TestController {
+
+		@GetMapping("test0")
+		String test0() {
+			return "test0";
+		}
+
+		@GetMapping("test1")
+		String test1() {
+			return "test1";
+		}
+
+		@GetMapping("test2")
+		String test2() {
+			return "test2";
+		}
+
+	}
+
 }

src/checkstyle/import-control.xml

@@ -61,6 +61,10 @@
 		<allow pkg="io.micrometer" />
 	</subpackage>
 
+	<subpackage name=".*\.observation" regex="true">
+		<allow pkg="io.micrometer" />
+	</subpackage>
+
 	<subpackage name="[^.]+\.actuate" regex="true">
 		<subpackage name="endpoint">
 			<file name=".*Endpoint(WebExtension)?" regex="true">