Update metrics feature components (#301)

Signed-off-by: Jari Kolehmainen <jari.kolehmainen@gmail.com>

src/main/feature.ts

@@ -48,9 +48,7 @@ export abstract class Feature {
     });
   }
 
-  upgrade(): boolean {
-    return true;
-  }
+  abstract async upgrade(cluster: Cluster): Promise<boolean>;
 
   abstract async uninstall(cluster: Cluster): Promise<boolean>;