Updated Kubernetes Version Upgrade FAQ (gardener#613)

Author: n-boshnakov

website/documentation/faq/automatic-upgrade.md

@@ -0,0 +1,27 @@
+---
+title: Upgrading Kubernetes Versions
+aliases: ["/docs/faq/automatic-upgrade/"]
+---
+
+## How can I upgrade my cluster versions?
+
+Upgrading your shoot cluster version can be done manually or by pressing the *Upgrade* button in the Dashboard.
+
+In order to manually update your cluster, you need to change the value of `kubernetes.version` in your shoot spec. Some specifics:
+
+- You must only increment by one minor version (`01.XX.01`) at a time. Supported versions can be found in your garden cluster's cloud profile.
+- You can increment by as many patch versions (`01.01.XX`) as you would like at once.
+- Once your cluster has been upgraded, you cannot rollback to a previous version.
+
+> [!WARNING]
+> Before updating a cluster, you should be aware of the [potential errors this might cause](https://github.com/gardener/gardener/blob/master/docs/usage/shoot/shoot_kubernetes_versions.md).
+
+The following video will dive into a Kubernetes outage in production that Monzo experienced, its causes and effects, and the architectural and operational lessons learned.
+
+<iframe width="560" height="315" src="https://www.youtube.com/embed/OUYTNywPk-s" frameborder="0" allow="autoplay; encrypted-media" allowfullscreen></iframe>
+
+It is therefore recommended to first update your test cluster and validate it before performing changes on a productive environment.
+
+## Can Kubernetes upgrade automatically?
+
+There is no automatic migration of major/minor versions of Kubernetes. You need to [update your clusters manually](#how-can-i-upgrade-my-cluster-versions) or press the *Upgrade* button in the Dashboard.