Adds missing contextd reference

without this change the BatchJobTagsProvider or BatchStepTagsProvider is not applied because it has a condition on instanceof BatchJobContext or BatchStepContext
with this change we're adding the missing context when the observation is created, without this the default context was used

Author: marcingrzejszczak

Diff for: spring-batch-core/src/main/java/org/springframework/batch/core/job/AbstractJob.java

@@ -308,7 +308,7 @@ public final void execute(JobExecution execution) {
 		LongTaskTimer longTaskTimer = BatchMetrics.createLongTaskTimer("job.active", "Active jobs",
 				Tag.of("name", execution.getJobInstance().getJobName()));
 		LongTaskTimer.Sample longTaskTimerSample = longTaskTimer.start();
-		Observation observation = BatchMetrics.createObservation(BatchJobObservation.BATCH_JOB_OBSERVATION.getName())
+		Observation observation = BatchMetrics.createObservation(BatchJobObservation.BATCH_JOB_OBSERVATION.getName(), new BatchJobContext(execution))
 				.contextualName(execution.getJobInstance().getJobName())
 				.tagsProvider(this.tagsProvider)
 				.start();

Diff for: spring-batch-core/src/main/java/org/springframework/batch/core/metrics/BatchMetrics.java

@@ -77,8 +77,8 @@ public static Timer createTimer(String name, String description, Tag... tags) {
 	 * in the user code. Otherwise you won't observe any metrics.
 	 * @return a new observation instance
 	 */
-	public static Observation createObservation(String name) {
-		return Observation.createNotStarted(name, Metrics.globalRegistry);
+	public static Observation createObservation(String name, Observation.Context context) {
+		return Observation.createNotStarted(name, context, Metrics.globalRegistry);
 	}
 
 	/**

Diff for: spring-batch-core/src/main/java/org/springframework/batch/core/step/AbstractStep.java

@@ -195,7 +195,7 @@ public final void execute(StepExecution stepExecution) throws JobInterruptedExce
 		}
 		stepExecution.setStartTime(new Date());
 		stepExecution.setStatus(BatchStatus.STARTED);
-		Observation observation = BatchMetrics.createObservation(BatchStepObservation.BATCH_STEP_OBSERVATION.getName())
+		Observation observation = BatchMetrics.createObservation(BatchStepObservation.BATCH_STEP_OBSERVATION.getName(), new BatchStepContext(stepExecution))
 				.contextualName(stepExecution.getStepName())
 				.tagsProvider(this.tagsProvider)
 				.start();

Diff for: spring-batch-samples/src/test/java/org/springframework/batch/sample/metrics/BatchMetricsTests.java

@@ -27,6 +27,7 @@
 
 import io.micrometer.core.instrument.Meter;
 import io.micrometer.core.instrument.Metrics;
+import org.junit.BeforeClass;
 import org.junit.Test;
 
 import org.springframework.batch.core.ExitStatus;
@@ -60,6 +61,11 @@ public class BatchMetricsTests {
 
 	private static final int EXPECTED_SPRING_BATCH_METRICS = 10;
 
+	@BeforeClass
+	public static void setup() {
+		Metrics.globalRegistry.withTimerObservationHandler();
+	}
+
 	@Test
 	public void testCalculateDuration() {
 		LocalDateTime startTime = LocalDateTime.now();