Add RBAC documentation for Ingress NGINX provider

docs/content/reference/dynamic-configuration/kubernetes-ingress-nginx-rbac.yml

@@ -0,0 +1,66 @@
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRole
+metadata:
+  name: traefik-ingress-nginx-controller
+rules:
+  - apiGroups:
+      - ""
+    resources:
+      - services
+      - secrets
+    verbs:
+      - list
+      - watch
+  # When using the watchNamespaceSelector option,
+  # Traefik requires permissions to list and watch namespaces.
+  - apiGroups:
+      - ""
+    resources:
+      - namespaces
+    verbs:
+      - list
+      - watch
+  # The pods right is needed to inject k8s.pod.uid and k8s.pod.name OTel attributes.
+  # When OTel tracing/logs/metrics are not enabled, this rule is not needed.
+  - apiGroups:
+      - ""
+    resources:
+      - pods
+    verbs:
+      - get
+  - apiGroups:
+      - discovery.k8s.io
+    resources:
+      - endpointslices
+    verbs:
+      - list
+      - watch
+  - apiGroups:
+      - networking.k8s.io
+    resources:
+      - ingresses
+      - ingressclasses
+    verbs:
+      - list
+      - watch
+  - apiGroups:
+      - networking.k8s.io
+    resources:
+      - ingresses/status
+    verbs:
+      - update
+
+---
+apiVersion: rbac.authorization.k8s.io/v1
+kind: ClusterRoleBinding
+metadata:
+  name: traefik-ingress-nginx-controller
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: traefik-ingress-nginx-controller
+subjects:
+  - kind: ServiceAccount
+    name: traefik-ingress-nginx-controller
+    namespace: default

docs/content/reference/install-configuration/providers/kubernetes/kubernetes-ingress-nginx.md

@@ -17,6 +17,21 @@ It also supports many of the [ingress-nginx](https://kubernetes.github.io/ingres
 
     For more information about the NGINX Ingress Controller retirement, see the [official Kubernetes blog announcement](https://kubernetes.io/blog/2025/11/11/ingress-nginx-retirement).
 
+## Requirements
+
+When you install Traefik without using the Helm Chart, 
+ensure that you add/update the [RBAC](https://kubernetes.io/docs/reference/access-authn-authz/rbac/) for the Traefik Kubernetes Ingress NGINX provider. 
+
+!!! note "Additional RBAC for Namespace Selector"
+
+    When using the `watchNamespaceSelector` option, Traefik requires permissions to list and watch namespaces.
+    These permissions are included in the RBAC configuration below.
+
+```bash
+# Install RBAC for Traefik Ingress NGINX provider:
+kubectl apply -f https://raw.githubusercontent.com/traefik/traefik/v3.6/docs/content/reference/dynamic-configuration/kubernetes-ingress-nginx-rbac.yml
+```
+
 ## Ingress Discovery
 
 This provider discovers all Ingresses in the cluster by default, which may lead to duplicated routers if you are also using the standard Kubernetes Ingress provider.