Polish "Add support for configuring the path of disk space metrics"

See gh-27660

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

@@ -18,7 +18,8 @@ package org.springframework.boot.actuate.autoconfigure.metrics;
 
 import java.io.File;
 import java.time.Duration;
-import java.util.Arrays;
+import java.util.ArrayList;
+import java.util.Collections;
 import java.util.LinkedHashMap;
 import java.util.List;
 import java.util.Map;
@@ -89,14 +90,14 @@ public class MetricsProperties {
 		return this.data;
 	}
 
-	public Distribution getDistribution() {
-		return this.distribution;
-	}
-
 	public System getSystem() {
 		return this.system;
 	}
 
+	public Distribution getDistribution() {
+		return this.distribution;
+	}
+
 	public static class Web {
 
 		private final Client client = new Client();
@@ -267,6 +268,33 @@ public class MetricsProperties {
 
 	}
 
+	public static class System {
+
+		private final Diskspace diskspace = new Diskspace();
+
+		public Diskspace getDiskspace() {
+			return this.diskspace;
+		}
+
+		public static class Diskspace {
+
+			/**
+			 * Comma-separated list of paths to report disk metrics for.
+			 */
+			private List<File> paths = new ArrayList<>(Collections.singletonList(new File(".")));
+
+			public List<File> getPaths() {
+				return this.paths;
+			}
+
+			public void setPaths(List<File> paths) {
+				this.paths = paths;
+			}
+
+		}
+
+	}
+
 	public static class Distribution {
 
 		/**
@@ -352,31 +380,4 @@ public class MetricsProperties {
 
 	}
 
-	public static class System {
-
-		private final Diskspace diskspace = new Diskspace();
-
-		public Diskspace getDiskspace() {
-			return this.diskspace;
-		}
-
-		public static class Diskspace {
-
-			/**
-			 * Comma-separated list of paths to report disk metrics for.
-			 */
-			private List<File> paths = Arrays.asList(new File("."));
-
-			public List<File> getPaths() {
-				return this.paths;
-			}
-
-			public void setPaths(List<File> paths) {
-				this.paths = paths;
-			}
-
-		}
-
-	}
-
 }

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

@@ -16,6 +16,9 @@
 
 package org.springframework.boot.actuate.autoconfigure.metrics;
 
+import java.io.File;
+import java.util.List;
+
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tags;
 import io.micrometer.core.instrument.binder.system.FileDescriptorMetrics;
@@ -28,6 +31,7 @@ import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnBean;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
 import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
 import org.springframework.context.annotation.Bean;
 import org.springframework.context.annotation.Configuration;
 
@@ -42,14 +46,9 @@ import org.springframework.context.annotation.Configuration;
 @AutoConfigureAfter({ MetricsAutoConfiguration.class, CompositeMeterRegistryAutoConfiguration.class })
 @ConditionalOnClass(MeterRegistry.class)
 @ConditionalOnBean(MeterRegistry.class)
+@EnableConfigurationProperties(MetricsProperties.class)
 public class SystemMetricsAutoConfiguration {
 
-	private final MetricsProperties properties;
-
-	public SystemMetricsAutoConfiguration(MetricsProperties properties) {
-		this.properties = properties;
-	}
-
 	@Bean
 	@ConditionalOnMissingBean
 	public UptimeMetrics uptimeMetrics() {
@@ -70,8 +69,9 @@ public class SystemMetricsAutoConfiguration {
 
 	@Bean
 	@ConditionalOnMissingBean
-	public DiskSpaceMetricsBinder diskSpaceMetrics() {
+	public DiskSpaceMetricsBinder diskSpaceMetrics(MetricsProperties properties) {
-		return new DiskSpaceMetricsBinder(this.properties.getSystem().getDiskspace().getPaths(), Tags.empty());
+		List<File> paths = properties.getSystem().getDiskspace().getPaths();
+		return new DiskSpaceMetricsBinder(paths, Tags.empty());
 	}
 
 }

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

@@ -326,6 +326,13 @@
         "reason": "Instead, filter 'process.uptime' and 'process.start.time' metrics."
       }
     },
+    {
+      "name": "management.metrics.system.diskspace.paths",
+      "type": "java.util.List<java.io.File>",
+      "defaultValue": [
+        "."
+      ]
+    },
     {
       "name": "management.metrics.export.appoptics.num-threads",
       "type": "java.lang.Integer",

spring-boot-project/spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/system/DiskSpaceMetricsBinder.java

@@ -22,7 +22,7 @@ import java.util.List;
 import io.micrometer.core.instrument.MeterRegistry;
 import io.micrometer.core.instrument.Tag;
 import io.micrometer.core.instrument.binder.MeterBinder;
-import io.micrometer.core.instrument.binder.jvm.DiskSpaceMetrics;
+import io.micrometer.core.instrument.binder.system.DiskSpaceMetrics;
 
 import org.springframework.util.Assert;