Restore configuration property for http requests names when using WebFlux

Closes gh-39083

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/observation/web/reactive/WebFluxObservationAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -30,10 +30,13 @@ 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.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnWebApplication;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.core.annotation.Order;
+import org.springframework.http.server.reactive.observation.DefaultServerRequestObservationConvention;
+import org.springframework.http.server.reactive.observation.ServerRequestObservationConvention;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for instrumentation of Spring
@@ -42,6 +45,7 @@ import org.springframework.core.annotation.Order;
  * @author Brian Clozel
  * @author Jon Schneider
  * @author Dmytro Nosan
+ * @author Moritz Halbritter
  * @since 3.0.0
  */
 @AutoConfiguration(after = { SimpleMetricsExportAutoConfiguration.class, ObservationAutoConfiguration.class })
@@ -51,15 +55,27 @@ import org.springframework.core.annotation.Order;
 @EnableConfigurationProperties({ MetricsProperties.class, ObservationProperties.class })
 public class WebFluxObservationAutoConfiguration {
 
+	private final ObservationProperties observationProperties;
+
+	WebFluxObservationAutoConfiguration(ObservationProperties observationProperties) {
+		this.observationProperties = observationProperties;
+	}
+
 	@Bean
 	@Order(0)
-	MeterFilter metricsHttpServerUriTagFilter(MetricsProperties metricsProperties,
-			ObservationProperties observationProperties) {
-		String name = observationProperties.getHttp().getServer().getRequests().getName();
+	MeterFilter metricsHttpServerUriTagFilter(MetricsProperties metricsProperties) {
+		String name = this.observationProperties.getHttp().getServer().getRequests().getName();
 		MeterFilter filter = new OnlyOnceLoggingDenyMeterFilter(
 				() -> "Reached the maximum number of URI tags for '%s'.".formatted(name));
 		return MeterFilter.maximumAllowableTags(name, "uri", metricsProperties.getWeb().getServer().getMaxUriTags(),
 				filter);
 	}
 
+	@Bean
+	@ConditionalOnMissingBean(ServerRequestObservationConvention.class)
+	DefaultServerRequestObservationConvention defaultServerRequestObservationConvention() {
+		return new DefaultServerRequestObservationConvention(
+				this.observationProperties.getHttp().getServer().getRequests().getName());
+	}
+
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/observation/web/reactive/WebFluxObservationAutoConfigurationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2023 the original author or authors.
+ * Copyright 2012-2024 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.
@@ -33,8 +33,11 @@ import org.springframework.boot.test.context.assertj.AssertableReactiveWebApplic
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
 import org.springframework.boot.test.system.CapturedOutput;
 import org.springframework.boot.test.system.OutputCaptureExtension;
+import org.springframework.http.server.reactive.observation.DefaultServerRequestObservationConvention;
+import org.springframework.http.server.reactive.observation.ServerRequestObservationConvention;
 
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
 
 /**
  * Tests for {@link WebFluxObservationAutoConfiguration}
@@ -42,6 +45,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  * @author Brian Clozel
  * @author Dmytro Nosan
  * @author Madhura Bhave
+ * @author Moritz Halbritter
  */
 @ExtendWith(OutputCaptureExtension.class)
 class WebFluxObservationAutoConfigurationTests {
@@ -91,6 +95,28 @@ class WebFluxObservationAutoConfigurationTests {
 			});
 	}
 
+	@Test
+	void shouldSupplyDefaultServerRequestObservationConvention() {
+		this.contextRunner.withPropertyValues("management.observations.http.server.requests.name=some-other-name")
+			.run((context) -> {
+				assertThat(context).hasSingleBean(DefaultServerRequestObservationConvention.class);
+				DefaultServerRequestObservationConvention bean = context
+					.getBean(DefaultServerRequestObservationConvention.class);
+				assertThat(bean.getName()).isEqualTo("some-other-name");
+			});
+	}
+
+	@Test
+	void shouldBackOffOnCustomServerRequestObservationConvention() {
+		this.contextRunner
+			.withBean("customServerRequestObservationConvention", ServerRequestObservationConvention.class,
+					() -> mock(ServerRequestObservationConvention.class))
+			.run((context) -> {
+				assertThat(context).hasBean("customServerRequestObservationConvention");
+				assertThat(context).hasSingleBean(ServerRequestObservationConvention.class);
+			});
+	}
+
 	private MeterRegistry getInitializedMeterRegistry(AssertableReactiveWebApplicationContext context) {
 		return getInitializedMeterRegistry(context, "http.server.requests");
 	}