Do not expose the composite ReactiveHealthIndicator as a bean

Previously, a `ReactiveHealthIndicator` bean was exposed to define the
health indicator to use for the reactive endpoint. Having it exposed as
a bean has the side effect that the regular `HealthIndicator` composite
is picked up and a "reactive" entry is added to the health details.

This commit creates such indicator internally as it should be.

Closes gh-11222

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/health/HealthWebEndpointManagementContextConfiguration.java

@@ -65,12 +65,13 @@ public class HealthWebEndpointManagementContextConfiguration {
 	@ConditionalOnWebApplication(type = Type.REACTIVE)
 	static class ReactiveWebHealthConfiguration {
 
-		@Bean
-		public ReactiveHealthIndicator reactiveHealthIndicator(
+		private final ReactiveHealthIndicator reactiveHealthIndicator;
+
+		ReactiveWebHealthConfiguration(
 				ObjectProvider<HealthAggregator> healthAggregator,
 				ObjectProvider<Map<String, ReactiveHealthIndicator>> reactiveHealthIndicators,
 				ObjectProvider<Map<String, HealthIndicator>> healthIndicators) {
-			return new CompositeReactiveHealthIndicatorFactory()
+			this.reactiveHealthIndicator = new CompositeReactiveHealthIndicatorFactory()
 					.createReactiveHealthIndicator(
 							healthAggregator.getIfAvailable(OrderedHealthAggregator::new),
 							reactiveHealthIndicators
@@ -83,10 +84,9 @@ public class HealthWebEndpointManagementContextConfiguration {
 		@ConditionalOnEnabledEndpoint
 		@ConditionalOnBean(HealthEndpoint.class)
 		public ReactiveHealthEndpointWebExtension reactiveHealthEndpointWebExtension(
-				ReactiveHealthIndicator reactiveHealthIndicator,
 				HealthStatusHttpMapper healthStatusHttpMapper,
 				HealthEndpointProperties properties) {
-			return new ReactiveHealthEndpointWebExtension(reactiveHealthIndicator,
+			return new ReactiveHealthEndpointWebExtension(this.reactiveHealthIndicator,
 					healthStatusHttpMapper, properties.isShowDetails());
 		}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/health/HealthWebEndpointReactiveManagementContextConfigurationTests.java

@@ -19,10 +19,17 @@ package org.springframework.boot.actuate.autoconfigure.health;
 import java.util.Map;
 
 import org.junit.Test;
+import reactor.core.publisher.Mono;
 
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.HealthEndpoint;
+import org.springframework.boot.actuate.health.HealthIndicator;
 import org.springframework.boot.actuate.health.HealthStatusHttpMapper;
 import org.springframework.boot.actuate.health.ReactiveHealthEndpointWebExtension;
+import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
 import org.springframework.test.util.ReflectionTestUtils;
 
 import static org.assertj.core.api.Assertions.assertThat;
@@ -72,4 +79,36 @@ public class HealthWebEndpointReactiveManagementContextConfigurationTests {
 				});
 	}
 
+	@Test
+	public void regularAndReactiveHealthIndicatorsMatch() {
+		this.contextRunner
+				.withUserConfiguration(HealthIndicatorsConfiguration.class)
+				.run((context) -> {
+					HealthEndpoint endpoint = context.getBean(HealthEndpoint.class);
+					ReactiveHealthEndpointWebExtension extension = context
+							.getBean(ReactiveHealthEndpointWebExtension.class);
+					Health endpointHealth = endpoint.health();
+					Health extensionHealth = extension.health(true).block().getBody();
+					assertThat(endpointHealth.getDetails())
+							.containsOnlyKeys("application", "first", "second");
+					assertThat(extensionHealth.getDetails())
+							.containsOnlyKeys("application", "first", "second");
+				});
+	}
+
+	@Configuration
+	static class HealthIndicatorsConfiguration {
+
+		@Bean
+		public HealthIndicator firstHealthIndicator() {
+			return () -> Health.up().build();
+		}
+
+		@Bean
+		public ReactiveHealthIndicator secondHealthIndicator() {
+			return () -> Mono.just(Health.up().build());
+		}
+
+	}
+
 }