Minor cleanup in the Metrics module:

 * Add missing Javadoc
 * Line formatting

No functional changes.

@@ -24,14 +24,17 @@ public class MetricsComponent implements MetricsComponentRegistry {
         name = newName;
     }
 
-    @Override public String getName() {
+    @Override
+    public String getName() {
         return name;
     }
 
-    @Override public MetricsFeature registerFeature(final String featureName) {
+    @Override
+    public MetricsFeature registerFeature(final String featureName) {
         MetricsFeature feature = featuresRegistry.get(featureName);
         if (feature == null) {
-            final MetricsFeature createdFeature = new MetricsFeature(featureName);
+            final MetricsFeature createdFeature =
+                new MetricsFeature(featureName);
             feature = featuresRegistry.putIfAbsent(featureName, createdFeature);
             if (feature == null) {
                 feature = createdFeature;

@@ -4,7 +4,18 @@ package org.onlab.metrics;
  * Registry Entry for Metrics Components.
  */
 public interface MetricsComponentRegistry {
+    /**
+     * Fetches the name of the Component.
+     *
+     * @return name of the Component
+     */
     String getName();
 
+    /**
+     * Registers a Feature for this component.
+     *
+     * @param featureName name of the Feature to register
+     * @return Feature object that can be used when creating Metrics
+     */
     MetricsFeature registerFeature(String featureName);
 }

@@ -15,6 +15,11 @@ public class MetricsFeature {
         name = newName;
     }
 
+    /**
+     * Fetches the name of the Feature.
+     *
+     * @return name of the Feature
+     */
     public String getName() {
         return name;
     }