Merge pull request #11997 from qinnnyul:add-health-indicator-for-reactive-mongo

* pr/11997:
  Polish "Add health indicator for reactive MongoDB"
  Add health indicator for reactive MongoDB

spring-boot-project/spring-boot-actuator-autoconfigure/pom.xml

@@ -248,6 +248,16 @@
 			<artifactId>liquibase-core</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.mongodb</groupId>
+			<artifactId>mongodb-driver-async</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.mongodb</groupId>
+			<artifactId>mongodb-driver-reactivestreams</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-jdbc</artifactId>

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/mongo/MongoHealthIndicatorAutoConfiguration.java

@@ -16,51 +16,32 @@
 
 package org.springframework.boot.actuate.autoconfigure.mongo;
 
-import java.util.Map;
-
-import org.springframework.boot.actuate.autoconfigure.health.CompositeHealthIndicatorConfiguration;
 import org.springframework.boot.actuate.autoconfigure.health.ConditionalOnEnabledHealthIndicator;
 import org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfiguration;
-import org.springframework.boot.actuate.health.HealthIndicator;
 import org.springframework.boot.actuate.mongo.MongoHealthIndicator;
 import org.springframework.boot.autoconfigure.AutoConfigureAfter;
 import org.springframework.boot.autoconfigure.AutoConfigureBefore;
 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.data.mongo.MongoDataAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
-import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
-import org.springframework.data.mongodb.core.MongoTemplate;
+import org.springframework.context.annotation.Import;
 
 /**
  * {@link EnableAutoConfiguration Auto-configuration} for {@link MongoHealthIndicator}.
  *
  * @author Christian Dupuis
+ * @author Stephane Nicoll
  * @since 2.0.0
  */
 @Configuration
-@ConditionalOnClass(MongoTemplate.class)
-@ConditionalOnBean(MongoTemplate.class)
 @ConditionalOnEnabledHealthIndicator("mongo")
 @AutoConfigureBefore(HealthIndicatorAutoConfiguration.class)
-@AutoConfigureAfter({ MongoAutoConfiguration.class, MongoDataAutoConfiguration.class })
-public class MongoHealthIndicatorAutoConfiguration extends
-		CompositeHealthIndicatorConfiguration<MongoHealthIndicator, MongoTemplate> {
-
-	private final Map<String, MongoTemplate> mongoTemplates;
-
-	public MongoHealthIndicatorAutoConfiguration(
-			Map<String, MongoTemplate> mongoTemplates) {
-		this.mongoTemplates = mongoTemplates;
-	}
-
-	@Bean
-	@ConditionalOnMissingBean(name = "mongoHealthIndicator")
-	public HealthIndicator mongoHealthIndicator() {
-		return createHealthIndicator(this.mongoTemplates);
-	}
+@AutoConfigureAfter({ MongoAutoConfiguration.class, MongoDataAutoConfiguration.class,
+		MongoReactiveDataAutoConfiguration.class })
+@Import({ MongoReactiveHealthIndicatorConfiguration.class,
+		MongoHealthIndicatorConfiguration.class })
+public class MongoHealthIndicatorAutoConfiguration {
 
 }

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/mongo/MongoHealthIndicatorConfiguration.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.mongo;
+
+import java.util.Map;
+
+import org.springframework.boot.actuate.autoconfigure.health.CompositeHealthIndicatorConfiguration;
+import org.springframework.boot.actuate.health.HealthIndicator;
+import org.springframework.boot.actuate.mongo.MongoHealthIndicator;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.MongoTemplate;
+
+/**
+ * Configuration for {@link MongoHealthIndicator}.
+ *
+ * @author Stephane Nicoll
+ */
+@Configuration
+@ConditionalOnClass(MongoTemplate.class)
+@ConditionalOnBean(MongoTemplate.class)
+class MongoHealthIndicatorConfiguration extends
+		CompositeHealthIndicatorConfiguration<MongoHealthIndicator, MongoTemplate> {
+
+	private final Map<String, MongoTemplate> mongoTemplates;
+
+	MongoHealthIndicatorConfiguration(
+			Map<String, MongoTemplate> mongoTemplates) {
+		this.mongoTemplates = mongoTemplates;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(name = "mongoHealthIndicator")
+	public HealthIndicator mongoHealthIndicator() {
+		return createHealthIndicator(this.mongoTemplates);
+	}
+
+}

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/mongo/MongoReactiveHealthIndicatorConfiguration.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.mongo;
+
+import java.util.Map;
+
+import org.springframework.boot.actuate.autoconfigure.health.CompositeReactiveHealthIndicatorConfiguration;
+import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
+import org.springframework.boot.actuate.mongo.MongoReactiveHealthIndicator;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+
+/**
+ * Configuration for {@link MongoReactiveHealthIndicator}.
+ *
+ * @author Stephane Nicoll
+ */
+@Configuration
+@ConditionalOnClass(ReactiveMongoTemplate.class)
+@ConditionalOnBean(ReactiveMongoTemplate.class)
+class MongoReactiveHealthIndicatorConfiguration extends
+		CompositeReactiveHealthIndicatorConfiguration<MongoReactiveHealthIndicator, ReactiveMongoTemplate> {
+
+	private final Map<String, ReactiveMongoTemplate> reactiveMongoTemplate;
+
+	MongoReactiveHealthIndicatorConfiguration(
+			Map<String, ReactiveMongoTemplate> reactiveMongoTemplate) {
+		this.reactiveMongoTemplate = reactiveMongoTemplate;
+	}
+
+	@Bean
+	@ConditionalOnMissingBean(name = "mongoHealthIndicator")
+	public ReactiveHealthIndicator mongoHealthIndicator() {
+		return createHealthIndicator(this.reactiveMongoTemplate);
+	}
+
+}

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

@@ -26,6 +26,7 @@ import org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoCo
 import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchRepositoriesAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
@@ -69,10 +70,11 @@ public class SpringApplicationHierarchyTests {
 	@EnableAutoConfiguration(exclude = { ElasticsearchDataAutoConfiguration.class,
 			ElasticsearchRepositoriesAutoConfiguration.class,
 			CassandraAutoConfiguration.class, CassandraDataAutoConfiguration.class,
-			MongoDataAutoConfiguration.class, Neo4jDataAutoConfiguration.class,
-			Neo4jRepositoriesAutoConfiguration.class, RedisAutoConfiguration.class,
-			RedisRepositoriesAutoConfiguration.class, FlywayAutoConfiguration.class,
-			JestAutoConfiguration.class, MetricsAutoConfiguration.class }, excludeName = {
+			MongoDataAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class,
+			Neo4jDataAutoConfiguration.class, Neo4jRepositoriesAutoConfiguration.class,
+			RedisAutoConfiguration.class, RedisRepositoriesAutoConfiguration.class,
+			FlywayAutoConfiguration.class, JestAutoConfiguration.class,
+			MetricsAutoConfiguration.class }, excludeName = {
 					"org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration" })
 	public static class Child {
 
@@ -81,10 +83,11 @@ public class SpringApplicationHierarchyTests {
 	@EnableAutoConfiguration(exclude = { ElasticsearchDataAutoConfiguration.class,
 			ElasticsearchRepositoriesAutoConfiguration.class,
 			CassandraAutoConfiguration.class, CassandraDataAutoConfiguration.class,
-			MongoDataAutoConfiguration.class, Neo4jDataAutoConfiguration.class,
-			Neo4jRepositoriesAutoConfiguration.class, RedisAutoConfiguration.class,
-			RedisRepositoriesAutoConfiguration.class, FlywayAutoConfiguration.class,
-			JestAutoConfiguration.class, MetricsAutoConfiguration.class }, excludeName = {
+			MongoDataAutoConfiguration.class, MongoReactiveDataAutoConfiguration.class,
+			Neo4jDataAutoConfiguration.class, Neo4jRepositoriesAutoConfiguration.class,
+			RedisAutoConfiguration.class, RedisRepositoriesAutoConfiguration.class,
+			FlywayAutoConfiguration.class, JestAutoConfiguration.class,
+			MetricsAutoConfiguration.class }, excludeName = {
 					"org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration" })
 	public static class Parent {
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/integrationtest/WebEndpointsAutoConfigurationIntegrationTests.java

@@ -28,6 +28,7 @@ import org.springframework.boot.autoconfigure.data.cassandra.CassandraDataAutoCo
 import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.elasticsearch.ElasticsearchDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.neo4j.Neo4jDataAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.neo4j.Neo4jRepositoriesAutoConfiguration;
 import org.springframework.boot.autoconfigure.data.redis.RedisAutoConfiguration;
@@ -39,6 +40,7 @@ import org.springframework.boot.autoconfigure.flyway.FlywayAutoConfiguration;
 import org.springframework.boot.autoconfigure.hazelcast.HazelcastAutoConfiguration;
 import org.springframework.boot.autoconfigure.liquibase.LiquibaseAutoConfiguration;
 import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
+import org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration;
 import org.springframework.boot.autoconfigure.solr.SolrAutoConfiguration;
 import org.springframework.boot.context.annotation.UserConfigurations;
 import org.springframework.boot.test.context.runner.ReactiveWebApplicationContextRunner;
@@ -81,8 +83,10 @@ public class WebEndpointsAutoConfigurationIntegrationTests {
 			LiquibaseAutoConfiguration.class, CassandraAutoConfiguration.class,
 			CassandraDataAutoConfiguration.class, Neo4jDataAutoConfiguration.class,
 			Neo4jRepositoriesAutoConfiguration.class, MongoAutoConfiguration.class,
+			MongoDataAutoConfiguration.class, MongoReactiveAutoConfiguration.class,
+			MongoReactiveDataAutoConfiguration.class,
 			RepositoryRestMvcAutoConfiguration.class, HazelcastAutoConfiguration.class,
-			MongoDataAutoConfiguration.class, ElasticsearchAutoConfiguration.class,
+			ElasticsearchAutoConfiguration.class,
 			ElasticsearchDataAutoConfiguration.class, JestAutoConfiguration.class,
 			SolrRepositoriesAutoConfiguration.class, SolrAutoConfiguration.class,
 			RedisAutoConfiguration.class, RedisRepositoriesAutoConfiguration.class,

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/mongo/MongoReactiveHealthIndicatorConfigurationTests.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.autoconfigure.mongo;
+
+import org.junit.Test;
+
+import org.springframework.boot.actuate.autoconfigure.health.HealthIndicatorAutoConfiguration;
+import org.springframework.boot.actuate.health.ApplicationHealthIndicator;
+import org.springframework.boot.actuate.mongo.MongoHealthIndicator;
+import org.springframework.boot.actuate.mongo.MongoReactiveHealthIndicator;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.autoconfigure.data.mongo.MongoDataAutoConfiguration;
+import org.springframework.boot.autoconfigure.data.mongo.MongoReactiveDataAutoConfiguration;
+import org.springframework.boot.autoconfigure.mongo.MongoAutoConfiguration;
+import org.springframework.boot.autoconfigure.mongo.MongoReactiveAutoConfiguration;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link MongoReactiveHealthIndicatorConfiguration}.
+ *
+ * @author Yulin Qin
+ */
+public class MongoReactiveHealthIndicatorConfigurationTests {
+
+	private ApplicationContextRunner contextRunner = new ApplicationContextRunner()
+			.withConfiguration(AutoConfigurations.of(
+					MongoAutoConfiguration.class,
+					MongoDataAutoConfiguration.class,
+					MongoReactiveAutoConfiguration.class,
+					MongoReactiveDataAutoConfiguration.class,
+					MongoHealthIndicatorAutoConfiguration.class,
+					HealthIndicatorAutoConfiguration.class));
+
+	@Test
+	public void runShouldCreateIndicator() {
+		this.contextRunner.run(
+				(context) -> assertThat(context).hasSingleBean(MongoReactiveHealthIndicator.class)
+						.doesNotHaveBean(MongoHealthIndicator.class)
+						.doesNotHaveBean(ApplicationHealthIndicator.class));
+	}
+
+	@Test
+	public void runWhenDisabledShouldNotCreateIndicator() {
+		this.contextRunner.withPropertyValues("management.health.mongo.enabled:false")
+				.run((context) -> assertThat(context)
+						.doesNotHaveBean(MongoReactiveHealthIndicator.class)
+						.doesNotHaveBean(MongoHealthIndicator.class)
+						.hasSingleBean(ApplicationHealthIndicator.class));
+	}
+
+}

spring-boot-project/spring-boot-actuator/pom.xml

@@ -142,6 +142,16 @@
 			<artifactId>liquibase-core</artifactId>
 			<optional>true</optional>
 		</dependency>
+		<dependency>
+			<groupId>org.mongodb</groupId>
+			<artifactId>mongodb-driver-async</artifactId>
+			<optional>true</optional>
+		</dependency>
+		<dependency>
+			<groupId>org.mongodb</groupId>
+			<artifactId>mongodb-driver-reactivestreams</artifactId>
+			<optional>true</optional>
+		</dependency>
 		<dependency>
 			<groupId>org.springframework</groupId>
 			<artifactId>spring-jdbc</artifactId>

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/mongo/MongoReactiveHealthIndicator.java

@@ -0,0 +1,55 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.mongo;
+
+import org.bson.Document;
+import reactor.core.publisher.Mono;
+
+import org.springframework.boot.actuate.health.AbstractReactiveHealthIndicator;
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.ReactiveHealthIndicator;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+import org.springframework.util.Assert;
+
+/**
+ * A {@link ReactiveHealthIndicator} for Mongo.
+ *
+ * @author Yulin Qin
+ * @since 2.0.0
+ */
+public class MongoReactiveHealthIndicator extends AbstractReactiveHealthIndicator {
+
+	private final ReactiveMongoTemplate reactiveMongoTemplate;
+
+	public MongoReactiveHealthIndicator(ReactiveMongoTemplate reactiveMongoTemplate) {
+		Assert.notNull(reactiveMongoTemplate, "ReactiveMongoTemplate must not be null");
+		this.reactiveMongoTemplate = reactiveMongoTemplate;
+	}
+
+	@Override
+	protected Mono<Health> doHealthCheck(Health.Builder builder) {
+		Mono<Document> buildInfo = this.reactiveMongoTemplate.executeCommand(
+				"{ buildInfo: 1 }");
+		return buildInfo.map(document -> up(builder, document));
+	}
+
+	private Health up(Health.Builder builder, Document document) {
+		return builder.up().withDetail("version", document.getString("version")).build();
+	}
+
+}
+

spring-boot-project/spring-boot-actuator/src/test/java/org/springframework/boot/actuate/mongo/MongoReactiveHealthIndicatorTest.java

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2012-2018 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.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.boot.actuate.mongo;
+
+import com.mongodb.MongoException;
+import org.bson.Document;
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import org.springframework.boot.actuate.health.Health;
+import org.springframework.boot.actuate.health.Status;
+import org.springframework.data.mongodb.core.ReactiveMongoTemplate;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.BDDMockito.given;
+import static org.mockito.Mockito.mock;
+
+/**
+ * Tests for {@link MongoReactiveHealthIndicator}.
+ *
+ * @author Yulin Qin
+ */
+public class MongoReactiveHealthIndicatorTest {
+
+	@Test
+	public void testMongoIsUp() {
+		Document buildInfo = mock(Document.class);
+		given(buildInfo.getString("version")).willReturn("2.6.4");
+		ReactiveMongoTemplate reactiveMongoTemplate = mock(ReactiveMongoTemplate.class);
+		given(reactiveMongoTemplate.executeCommand("{ buildInfo: 1 }")).willReturn(
+				Mono.just(buildInfo));
+
+		MongoReactiveHealthIndicator mongoReactiveHealthIndicator = new MongoReactiveHealthIndicator(reactiveMongoTemplate);
+		Mono<Health> health = mongoReactiveHealthIndicator.health();
+		StepVerifier.create(health).consumeNextWith((h) -> {
+			assertThat(h.getStatus()).isEqualTo(Status.UP);
+			assertThat(h.getDetails()).containsOnlyKeys("version");
+			assertThat(h.getDetails().get("version")).isEqualTo("2.6.4");
+		}).verifyComplete();
+	}
+
+	@Test
+	public void testMongoIsDown() {
+		ReactiveMongoTemplate reactiveMongoTemplate = mock(ReactiveMongoTemplate.class);
+		given(reactiveMongoTemplate.executeCommand("{ buildInfo: 1 }")).willThrow(
+				new MongoException("Connection failed"));
+
+		MongoReactiveHealthIndicator mongoReactiveHealthIndicator = new MongoReactiveHealthIndicator(reactiveMongoTemplate);
+		Mono<Health> health = mongoReactiveHealthIndicator.health();
+		StepVerifier.create(health).consumeNextWith((h) -> {
+			assertThat(h.getStatus()).isEqualTo(Status.DOWN);
+			assertThat(h.getDetails()).containsOnlyKeys("error");
+			assertThat(h.getDetails().get("error")).isEqualTo("Connection failed");
+		}).verifyComplete();
+	}
+
+}

spring-boot-project/spring-boot-docs/src/main/asciidoc/production-ready-features.adoc

@@ -723,6 +723,9 @@ appropriate:
 |===
 |Name |Description
 
+|{sc-spring-boot-actuator}/mongo/MongoReactiveHealthIndicator.{sc-ext}[`MongoReactiveHealthIndicator`]
+|Checks that a Mongo database is up.
+
 |{sc-spring-boot-actuator}/redis/RedisReactiveHealthIndicator.{sc-ext}[`RedisReactiveHealthIndicator`]
 |Checks that a Redis server is up.
 |===