Polish Spring Integration metrics support

See gh-7722

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

@@ -92,7 +92,7 @@ public class PublicMetricsAutoConfigurationTests {
 	public void metricReaderPublicMetrics() throws Exception {
 		load();
 		assertThat(this.context.getBeansOfType(MetricReaderPublicMetrics.class))
-				.hasSize(1);
+				.hasSize(2);
 	}
 
 	@Test

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/integration/SpringIntegrationMetricReaderNoJmxTests.java

@@ -16,7 +16,6 @@
 
 package org.springframework.boot.actuate.metrics.integration;
 
-
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
@@ -53,7 +52,7 @@ public class SpringIntegrationMetricReaderNoJmxTests {
 	}
 
 	@Configuration
-	@Import({IntegrationAutoConfiguration.class, PublicMetricsAutoConfiguration.class})
+	@Import({ IntegrationAutoConfiguration.class, PublicMetricsAutoConfiguration.class })
 	protected static class TestConfiguration {
 
 	}

spring-boot-actuator/src/test/java/org/springframework/boot/actuate/metrics/integration/SpringIntegrationMetricReaderTests.java

@@ -56,7 +56,8 @@ public class SpringIntegrationMetricReaderTests {
 	protected static class TestConfiguration {
 
 		@Bean
-		public SpringIntegrationMetricReader reader(IntegrationManagementConfigurer managementConfigurer) {
+		public SpringIntegrationMetricReader reader(
+				IntegrationManagementConfigurer managementConfigurer) {
 			return new SpringIntegrationMetricReader(managementConfigurer);
 		}