Add auto_gerated metadata

content/en/docs/reference/kubernetes-api/extend-resources/_index.md

@@ -1,4 +1,17 @@
 ---
 title: "Extend Resources"
 weight: 7
+auto_generated: true
 ---
+
+<!--
+The file is auto-generated from the Go source code of the component using a generic
+[generator](https://github.com/kubernetes-sigs/reference-docs/). To learn how
+to generate the reference documentation, please read
+[Contributing to the reference documentation](/docs/contribute/generate-ref-docs/).
+To update the reference content, please follow the 
+[Contributing upstream](/docs/contribute/generate-ref-docs/contribute-upstream/)
+guide. You can file document formatting bugs against the
+[reference-docs](https://github.com/kubernetes-sigs/reference-docs/) project.
+-->
+