ObservationPatterns as property placeholder

Make an `@EnableIntegrationManagement.observationPatterns`
as property placeholder aware and also support comma-separated values

Author: artembilan

spring-integration-core/src/main/java/org/springframework/integration/config/EnableIntegrationManagement.java

@@ -68,6 +68,7 @@
 	 * None by default - no unconditional observation instrumentation.
 	 * Can be set to {@code *} to instrumentation all the integration components.
 	 * The pattern can start with {@code !} to negate the matching.
+	 * The value can be a property placeholder and/or comma-separated.
 	 * @since 6.0
 	 * @see org.springframework.integration.support.utils.PatternMatchUtils#smartMatch(String, String...)
 	 */

spring-integration-core/src/main/java/org/springframework/integration/config/IntegrationManagementConfiguration.java

@@ -16,7 +16,9 @@
 
 package org.springframework.integration.config;
 
+import java.util.HashSet;
 import java.util.Map;
+import java.util.Set;
 
 import org.springframework.beans.factory.ObjectProvider;
 import org.springframework.beans.factory.config.BeanDefinition;
@@ -32,6 +34,7 @@
 import org.springframework.util.Assert;
 
 import io.micrometer.observation.ObservationRegistry;
+import org.springframework.util.StringUtils;
 
 /**
  * {@code @Configuration} class that registers a {@link IntegrationManagementConfigurer} bean.
@@ -75,12 +78,22 @@ public IntegrationManagementConfigurer managementConfigurer(
 				Boolean.parseBoolean(this.environment.resolvePlaceholders(
 						(String) this.attributes.get("defaultLoggingEnabled"))));
 		configurer.setMetricsCaptorProvider(metricsCaptorProvider);
-		String[] observationPatterns = (String[]) this.attributes.get("observationPatterns");
+		String[] observationPatterns = obtainObservationPatterns();
 		if (observationPatterns.length > 0) {
 			configurer.setObservationPatterns(observationPatterns);
 			configurer.setObservationRegistry(observationRegistryProvider);
 		}
 		return configurer;
 	}
 
+	private String[] obtainObservationPatterns() {
+		Set<String> patterns = new HashSet<>();
+		String[] observationPatterns = (String[]) this.attributes.get("observationPatterns");
+		for (String observationPattern : observationPatterns) {
+			String pattern = this.environment.resolvePlaceholders(observationPattern);
+			patterns.addAll(StringUtils.commaDelimitedListToSet(pattern));
+		}
+		return patterns.toArray(new String[0]);
+	}
+
 }

spring-integration-core/src/test/java/org/springframework/integration/support/management/observation/IntegrationObservabilityZipkinTests.java

@@ -106,7 +106,9 @@ public SampleTestRunnerConsumer yourCode() {
 
 	@Configuration
 	@EnableIntegration
-	@EnableIntegrationManagement(observationPatterns = { "observedEndpoint", "testInboundGateway" })
+	@EnableIntegrationManagement(
+			observationPatterns =
+					"${spring.integration.management.observation-patterns:observedEndpoint,testInboundGateway}")
 	public static class ObservationIntegrationTestConfiguration {
 
 		CountDownLatch observedHandlerLatch = new CountDownLatch(1);