Auto-configure ObservationRegistry on ScheduledTaskRegistrar

The TaskSchedulingAutoConfiguration.taskScheduler auto-configuration now
no longer backs off on SchedulingConfigurer beans.

Closes gh-36119

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/scheduling/ScheduledTasksObservabilityAutoConfiguration.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 2012-2023 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
+ *
+ *      https://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.scheduling;
+
+import io.micrometer.observation.ObservationRegistry;
+
+import org.springframework.boot.actuate.autoconfigure.observation.ObservationAutoConfiguration;
+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.context.annotation.Bean;
+import org.springframework.scheduling.annotation.SchedulingConfigurer;
+import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+/**
+ * {@link EnableAutoConfiguration Auto-configuration} to enable observability for
+ * scheduled tasks.
+ *
+ * @author Moritz Halbritter
+ * @since 3.2.0
+ */
+@AutoConfiguration(after = ObservationAutoConfiguration.class)
+@ConditionalOnBean(ObservationRegistry.class)
+@ConditionalOnClass(ThreadPoolTaskScheduler.class)
+public class ScheduledTasksObservabilityAutoConfiguration {
+
+	@Bean
+	ObservabilitySchedulingConfigurer observabilitySchedulingConfigurer(ObservationRegistry observationRegistry) {
+		return new ObservabilitySchedulingConfigurer(observationRegistry);
+	}
+
+	static final class ObservabilitySchedulingConfigurer implements SchedulingConfigurer {
+
+		private final ObservationRegistry observationRegistry;
+
+		ObservabilitySchedulingConfigurer(ObservationRegistry observationRegistry) {
+			this.observationRegistry = observationRegistry;
+		}
+
+		@Override
+		public void configureTasks(ScheduledTaskRegistrar taskRegistrar) {
+			taskRegistrar.setObservationRegistry(this.observationRegistry);
+		}
+
+	}
+
+}

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

@@ -93,6 +93,7 @@ org.springframework.boot.actuate.autoconfigure.r2dbc.ConnectionFactoryHealthCont
 org.springframework.boot.actuate.autoconfigure.data.redis.RedisHealthContributorAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.data.redis.RedisReactiveHealthContributorAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.scheduling.ScheduledTasksEndpointAutoConfiguration
+org.springframework.boot.actuate.autoconfigure.scheduling.ScheduledTasksObservabilityAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.security.reactive.ReactiveManagementWebSecurityAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.security.servlet.ManagementWebSecurityAutoConfiguration
 org.springframework.boot.actuate.autoconfigure.session.SessionsEndpointAutoConfiguration

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

@@ -0,0 +1,64 @@
+/*
+ * Copyright 2012-2023 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
+ *
+ *      https://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.scheduling;
+
+import java.util.List;
+
+import io.micrometer.observation.ObservationRegistry;
+import org.junit.jupiter.api.Test;
+
+import org.springframework.boot.actuate.autoconfigure.observation.ObservationAutoConfiguration;
+import org.springframework.boot.actuate.autoconfigure.scheduling.ScheduledTasksObservabilityAutoConfiguration.ObservabilitySchedulingConfigurer;
+import org.springframework.boot.autoconfigure.AutoConfiguration;
+import org.springframework.boot.autoconfigure.AutoConfigurations;
+import org.springframework.boot.context.annotation.ImportCandidates;
+import org.springframework.boot.test.context.runner.ApplicationContextRunner;
+import org.springframework.scheduling.config.ScheduledTaskRegistrar;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link ScheduledTasksObservabilityAutoConfiguration}.
+ *
+ * @author Moritz Halbritter
+ */
+class ScheduledTasksObservabilityAutoConfigurationTests {
+
+	private final ApplicationContextRunner runner = new ApplicationContextRunner().withConfiguration(AutoConfigurations
+		.of(ObservationAutoConfiguration.class, ScheduledTasksObservabilityAutoConfiguration.class));
+
+	@Test
+	void shouldProvideObservabilitySchedulingConfigurer() {
+		this.runner.run((context) -> assertThat(context).hasSingleBean(ObservabilitySchedulingConfigurer.class));
+	}
+
+	@Test
+	void observabilitySchedulingConfigurerShouldConfigureObservationRegistry() {
+		ObservationRegistry observationRegistry = ObservationRegistry.create();
+		ObservabilitySchedulingConfigurer configurer = new ObservabilitySchedulingConfigurer(observationRegistry);
+		ScheduledTaskRegistrar registrar = new ScheduledTaskRegistrar();
+		configurer.configureTasks(registrar);
+		assertThat(registrar.getObservationRegistry()).isEqualTo(observationRegistry);
+	}
+
+	@Test
+	void isRegisteredInAutoConfigurationsFile() {
+		List<String> configurations = ImportCandidates.load(AutoConfiguration.class, null).getCandidates();
+		assertThat(configurations).contains(ScheduledTasksObservabilityAutoConfiguration.class.getName());
+	}
+
+}

spring-boot-project/spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/task/TaskSchedulingAutoConfiguration.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2012-2022 the original author or authors.
+ * Copyright 2012-2023 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.
@@ -31,7 +31,6 @@ import org.springframework.boot.task.TaskSchedulerBuilder;
 import org.springframework.boot.task.TaskSchedulerCustomizer;
 import org.springframework.context.annotation.Bean;
 import org.springframework.scheduling.TaskScheduler;
-import org.springframework.scheduling.annotation.SchedulingConfigurer;
 import org.springframework.scheduling.concurrent.ThreadPoolTaskScheduler;
 import org.springframework.scheduling.config.TaskManagementConfigUtils;
 
@@ -48,7 +47,7 @@ public class TaskSchedulingAutoConfiguration {
 
 	@Bean
 	@ConditionalOnBean(name = TaskManagementConfigUtils.SCHEDULED_ANNOTATION_PROCESSOR_BEAN_NAME)
-	@ConditionalOnMissingBean({ SchedulingConfigurer.class, TaskScheduler.class, ScheduledExecutorService.class })
+	@ConditionalOnMissingBean({ TaskScheduler.class, ScheduledExecutorService.class })
 	public ThreadPoolTaskScheduler taskScheduler(TaskSchedulerBuilder builder) {
 		return builder.build();
 	}

spring-boot-project/spring-boot-autoconfigure/src/test/java/org/springframework/boot/autoconfigure/task/TaskSchedulingAutoConfigurationTests.java

@@ -122,17 +122,6 @@ class TaskSchedulingAutoConfigurationTests {
 			});
 	}
 
-	@Test
-	void enableSchedulingWithConfigurerBacksOff() {
-		this.contextRunner.withUserConfiguration(SchedulingConfiguration.class, SchedulingConfigurerConfiguration.class)
-			.run((context) -> {
-				assertThat(context).doesNotHaveBean(TaskScheduler.class);
-				TestBean bean = context.getBean(TestBean.class);
-				assertThat(bean.latch.await(30, TimeUnit.SECONDS)).isTrue();
-				assertThat(bean.threadNames).containsExactly("test-1");
-			});
-	}
-
 	@Test
 	void enableSchedulingWithLazyInitializationInvokeScheduledMethods() {
 		List<String> threadNames = new ArrayList<>();