📖 follow up of update metrics documentation to bring more clarity kub…

…ernetes-sigs#4358

docs/book/src/reference/metrics.md

@@ -3,6 +3,7 @@
 By default, controller-runtime builds a global prometheus registry and
 publishes [a collection of performance metrics](/reference/metrics-reference.md) for each controller.
 
+
 <aside class="note warning">
 <h1>IMPORTANT: If you are using `kube-rbac-proxy`</h1>
 
@@ -11,10 +12,14 @@ Your projects will be affected and may fail to work if the image cannot be pulle
 
 **Images provided under `gcr.io/kubebuilder/` will be unavailable from early 2025.**
 
-- **Projects initialized with Kubebuilder versions `v3.14` or lower** utilize [kube-rbac-proxy](https://github.com/brancz/kube-rbac-proxy) to protect the metrics endpoint. Therefore, you might want to continue using kube-rbac-proxy by simply replacing the image or changing how the metrics endpoint is protected in your project.
+- **Projects initialized with Kubebuilder versions `v3.14` or lower** utilize [kube-rbac-proxy](https://github.com/brancz/kube-rbac-proxy) to protect the metrics endpoint.
+Please check your project and make sure you make the changes. In this case, you might want to upgrade your project to the latest release or ensure that you have applied the same or similar code changes.
+
+- **However, projects initialized with Kubebuilder versions `v4.1.0` or higher** have similar protection using `authn/authz`
+enabled by default via Controller-Runtime's feature [WithAuthenticationAndAuthorization](https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/metrics/filters#WithAuthenticationAndAuthorization).
 
-- **However, projects initialized with Kubebuilder versions `v4.1.0` or higher** have a similar protection using authn/authz enabled by default via Controller-Runtime's feature [WithAuthenticationAndAuthorization](https://pkg.go.dev/sigs.k8s.io/[email protected]/pkg/metrics/filters#WithAuthenticationAndAuthorization).
-In this case, you might want to upgrade your project or simply ensure that you have applied the same code changes to it.
+If you want to use still using [kube-rbac-proxy](https://github.com/brancz/kube-rbac-proxy) then you MUST change 
+your project to use the image from another source.
 
 > This infrastructure is outside of our control, we cannot guarantee any timeline or any extensions.
 > For further information, see: [kubebuilder/discussions/3907](https://github.com/kubernetes-sigs/kubebuilder/discussions/3907)