Documentation: Adds sticky cookie note for k8s multiple replica setups (#3120)

docs/installation/k8s.md

@@ -361,3 +361,33 @@ spec:
                 port:
                   number: 3000
 ```
+
+### Multiple Replicas
+
+If you plan to deploy homepage with a replica count greater than 1, you may
+want to consider enabling sticky sessions on the homepage route. This will
+prevent unnecessary re-renders on page loads and window / tab focusing. The
+procedure for enabling sticky sessions depends on your Ingress controller. Below
+is an example using Traefik as the Ingress controller.
+
+```
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: homepage.example.com
+spec:
+  entryPoints:
+    - websecure
+  routes:
+    - kind: Rule
+      match: Host(`homepage.example.com`)
+      services:
+        - kind: Service
+          name: homepage
+          port: 3000
+          sticky:
+            cookie:
+              httpOnly: true
+              secure: true
+              sameSite: none
+```