SleepMode docs w/pending config reference

vcluster/configure/vcluster-yaml/experimental/native-sleep-mode.mdx

@@ -0,0 +1,76 @@
+---
+title: Experimental Sleep Mode
+sidebar_label: sleepMode
+sidebar_position: 7
+sidebar_class_name: pro
+description: Configure a vCluster to sleep/wake without an agent
+---
+
+import ProAdmonition from '../../../_partials/admonitions/pro-admonition.mdx'
+
+<ProAdmonition />
+
+:::warning
+Native sleep mode is intended for pre-production use cases only, and comes with some limitations and
+caveats.
+:::
+
+### Configuration examples
+
+#### Sleep after 3 hours of inactivity, anything that does not have the label `dont=sleep`
+
+```yaml
+experimental:
+  sleepMode:
+    enabled: true
+    autoSleep:
+      afterInactivity: 3h  # Uses Go's Duration with a max unit of hour
+      exclude:
+        selector:
+          labels:
+            dont: sleep
+```
+
+#### Sleep every Friday at 17:30 and wake every Monday at 7:00 in Mountain timezone
+
+```yaml
+experimental:
+  sleepMode:
+    enabled: true
+    timezone: America/Denver
+    autoSleep:
+      schedule: 30 17 * * 5
+      wakeup:
+        schedule: 0 7 * * 1
+```
+
+### How it works
+
+**Sleeping** will delete bare pods and scale down the following resources:
+  * Deployments
+  * ReplicaSets
+  * ReplicationControllers
+  * DaemonSets
+
+**Waking** will scale those resources back up, but it will be unable to restore bare pods.  To exempt resources from being
+put to sleep, either add the annotation `sleepmode.loft.sh/exclude: true` or configure sleep mode with labels to exclude and
+add that label to all the workloads you'd like to keep running.
+
+### Detecting activity
+
+To wake a sleeping cluster or to update the last active time, native sleep mode captures the following:
+
+ * Access of cluster resources.  _Think `kubectl get <resource>`_
+ * Attempts to contact Ingress endpoints (NGINX only).
+
+:::info Note:
+Ingress activity detection is only available for [NGINX](https://github.com/kubernetes/ingress-nginx/tree/main)
+ingress controllers, making use of the [mirror-target](https://github.com/kubernetes/ingress-nginx/blob/main/docs/user-guide/nginx-configuration/annotations.md#mirror)
+annotation.  If you use this annotation, it will be overwritten for the sleep mode to function.
+:::
+
+## Config reference
+
+:::info 🚧
+Coming soon
+:::