Added Samples and Documentation for metrics

Updated documentation and sample

Updated the test to use original metrics definition

spring-cloud-task-samples/task-metrics/src/main/java/io/spring/taskmetrics/MetricConfiguration.java

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2022-2022 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 io.spring.taskmetrics;
+
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+@Configuration
+public class MetricConfiguration {
+	@Bean
+	public SimpleMeterRegistry meterRegistry() {
+		return new SimpleMeterRegistry();
+	}
+}

spring-cloud-task-samples/task-metrics/src/main/java/io/spring/taskmetrics/TaskMetricsApplication.java

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+/*
+ * Copyright 2022-2022 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 io.spring.taskmetrics;
+
+import io.micrometer.core.instrument.simple.SimpleMeterRegistry;
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.ApplicationArguments;
+import org.springframework.boot.ApplicationRunner;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.task.configuration.EnableTask;
+import org.springframework.cloud.task.listener.annotation.AfterTask;
+import org.springframework.cloud.task.repository.TaskExecution;
+import org.springframework.context.annotation.Bean;
+
+@SpringBootApplication
+@EnableTask
+public class TaskMetricsApplication {
+
+	private static final Log logger = LogFactory.getLog(TaskMetricsApplication.class);
+
+	@Autowired
+	public SimpleMeterRegistry simpleMeterRegistry;
+
+	public static void main(String[] args) {
+		SpringApplication.run(TaskMetricsApplication.class, args);
+	}
+
+	@Bean
+	public ApplicationRunner applicationRunner() {
+		return new ApplicationRunner() {
+			@Override
+			public void run(ApplicationArguments args) throws Exception {
+				logger.info("Hello ApplicationRunner Metric's World");
+			}
+		};
+	}
+
+	@Bean
+	public CommandLineRunner commandLineRunner() {
+		return new CommandLineRunner() {
+			@Override
+			public void run(String... args) throws Exception {
+				logger.info("Hello CommandLineRunner Metric's World");
+			}
+		};
+	}
+
+	/**
+	 * Prints the metrics as recorded in the simpleMeterRegistry.
+	 */
+	@AfterTask
+	public void afterTask(TaskExecution taskExecution) {
+		System.out.println(simpleMeterRegistry.getMetersAsString());
+	}
+
+}

spring-cloud-task-samples/task-metrics/src/main/resources/application.properties

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+logging.level.org.springframework.cloud.task=debug
+management.metrics.tags.service=task-metrics-application
+management.metrics.tags.application=task-metrics-application-58
+spring.cloud.task.name=taskmetrics
+spring.cloud.task.observation.enabled=true
+

spring-cloud-task-samples/task-metrics/src/test/java/io/spring/taskmetrics/TaskMetricsApplicationTests.java

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+/*
+ * Copyright 2022-2022 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 io.spring.taskmetrics;
+
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.system.CapturedOutput;
+import org.springframework.boot.test.system.OutputCaptureExtension;
+
+import static org.assertj.core.api.AssertionsForInterfaceTypes.assertThat;
+
+@SpringBootTest
+@ExtendWith(OutputCaptureExtension.class)
+class TaskMetricsApplicationTests {
+
+	@Test
+	void contextLoads(CapturedOutput output) {
+		String result = output.getAll();
+		assertThat(result).contains("spring.cloud.task(TIMER)[application=" +
+			"'task-metrics-application-58', service='task-metrics-application', " +
+			"task.exception='none', task.execution.id='");
+	}
+
+}