Polish “Auto-configure FileDescriptorMetrics”

Closes gh-12022

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/MetricsAutoConfiguration.java

@@ -128,7 +128,7 @@ public class MetricsAutoConfiguration {
 		}
 
 		@Bean
-		@ConditionalOnProperty(name = "management.metrics.binders.fds.enabled", matchIfMissing = true)
+		@ConditionalOnProperty(name = "management.metrics.binders.files.enabled", matchIfMissing = true)
 		@ConditionalOnMissingBean
 		public FileDescriptorMetrics fileDescriptorMetrics() {
 			return new FileDescriptorMetrics();

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/resources/META-INF/additional-spring-configuration-metadata.json

@@ -179,7 +179,13 @@
       "name": "management.info.git.mode",
       "defaultValue": "simple"
     },
-        {
+    {
+      "name": "management.metrics.binders.files.enabled",
+      "type": "java.lang.Boolean",
+      "description": "Whether to enable files metrics.",
+      "defaultValue": true
+    },
+    {
       "name": "management.metrics.binders.integration.enabled",
       "type": "java.lang.Boolean",
       "description": "Whether to enable Spring Integration metrics.",

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/metrics/MetricsAutoConfigurationTests.java

@@ -213,20 +213,19 @@ public class MetricsAutoConfigurationTests {
 
 	@Test
 	public void autoConfiguresFileDescriptorMetrics() {
-		this.runner.run(
-				(context) -> assertThat(context)
-						.hasSingleBean(FileDescriptorMetrics.class));
+		this.runner.run((context) -> assertThat(context)
+				.hasSingleBean(FileDescriptorMetrics.class));
 	}
 
 	@Test
 	public void allowsFileDescriptorMetricsToBeDisabled() {
-		this.runner.withPropertyValues("management.metrics.binders.fds.enabled=false")
+		this.runner.withPropertyValues("management.metrics.binders.files.enabled=false")
 				.run((context) -> assertThat(context)
 						.doesNotHaveBean(FileDescriptorMetrics.class));
 	}
 
 	@Test
-	public void allowsCustomFileDescriptorToBeUsed() {
+	public void allowsCustomFileDescriptorMetricsToBeUsed() {
 		this.runner.withUserConfiguration(CustomFileDescriptorMetricsConfiguration.class)
 				.run((context) -> assertThat(context)
 						.hasSingleBean(FileDescriptorMetrics.class)

spring-boot-project/spring-boot-docs/src/main/asciidoc/appendix-application-properties.adoc

@@ -1295,6 +1295,7 @@ content into your application. Rather, pick only the properties that you need.
 	management.info.git.mode=simple # Mode to use to expose git information.
 
 	# METRICS
+	management.metrics.binders.files.enabled=true # Whether to enable files metrics.
 	management.metrics.binders.integration.enabled=true # Whether to enable Spring Integration metrics.
 	management.metrics.binders.jvm.enabled=true # Whether to enable JVM metrics.
 	management.metrics.binders.logback.enabled=true # Whether to enable Logback metrics.