Add to Command SplitControllerAndExtensions not found documentation f…

…or leader election

site/content/en/docs/Advanced/high-availability-agones.md

@@ -13,6 +13,8 @@ publishDate: 2023-02-28
 
 When `SplitControllerAndExtensions` is enabled, the `agones-controller` responsibility is split up into `agones-controller`, which enacts the Agones control loop, and `agones-extensions`, which acts as a service endpoint for webhooks and the allocation extension API. Splitting these responsibilities allows the `agones-extensions` pod to be **horizontally scaled**, making the Agones control plane **highly available** and more **resiliant to disruption**.
 
+`SplitControllerAndExtensions` also permits the multiple `agones-controller` and leader eleciton usage. Having multiple `agones-controller` minimizes downtime of the service from voluntary pod disruptions such as pod deletes, deployment updates, and pod restarts.
+
 {{< alert title="GKE Autopilot Clusters" color="warning" >}}
 `SplitControllerAndExtensions` must be enabled for GKE Autopilot.
 {{< /alert >}}
@@ -34,14 +36,31 @@ An important configuration to note is the PodDisruptionBudget fields, `agones.ex
 
 ## Deployment Considerations
 
-When `SplitControllerAndExtensions` is enabled, what was previously a single `agones-controller` pod is deployed as `agones-controller` and 2 `agones-extensions` pods. For example: 
+Leader election will automatically be enabled while `SplitControllerAndExtensions` is enabled and while `agones.controller.replicas` is set to > 1. The current default value for [`agones.controller.replicas`]({{< relref "/docs/Installation/Install Agones/helm.md#configuration" >}}) is 2.
+
+When `SplitControllerAndExtensions` is enabled, what was previously a single `agones-controller` pod is deployed as, possibly 2, `agones-controller` and 2 `agones-extensions` pods. For example: 
+
+```
+NAME                                 READY   STATUS    RESTARTS   AGE
+agones-allocator-78c6b8c79-h9nqc     1/1     Running   0          23h
+agones-allocator-78c6b8c79-l2bzp     1/1     Running   0          23h
+agones-allocator-78c6b8c79-rw75j     1/1     Running   0          23h
+agones-controller-fbf944f4-vs9xx     1/1     Running   0          23h
+agones-extensions-5648fc7dcf-hm6lk   1/1     Running   0          23h
+agones-extensions-5648fc7dcf-qbc6h   1/1     Running   0          23h
+agones-ping-5b9647874-2rrl6          1/1     Running   0          27h
+agones-ping-5b9647874-rksgg          1/1     Running   0          27h
+```
+
+Or if `agones.controller.replicas` > 1
 
 ```
 NAME                                 READY   STATUS    RESTARTS   AGE
 agones-allocator-78c6b8c79-h9nqc     1/1     Running   0          23h
 agones-allocator-78c6b8c79-l2bzp     1/1     Running   0          23h
 agones-allocator-78c6b8c79-rw75j     1/1     Running   0          23h
 agones-controller-fbf944f4-vs9xx     1/1     Running   0          23h
+agones-controller-fbf944f4-sjk3t     1/1     Running   0          23h
 agones-extensions-5648fc7dcf-hm6lk   1/1     Running   0          23h
 agones-extensions-5648fc7dcf-qbc6h   1/1     Running   0          23h
 agones-ping-5b9647874-2rrl6          1/1     Running   0          27h