How to add K8S feature gates to my shoot cluster?

  less than a minute  

Adding a Feature Gate

In order to add a feature gate, add it as enabled to the appropriate section of the shoot.yaml file:

SectionName:
    featureGates:
        SomeKubernetesFeature: true

The available sections are kubelet, kubernetes, kubeAPIServer, kubeControllerManager, kubeScheduler, and kubeProxy.

For more detals, see the example shoot.yaml file.

What is the expected downtime when updating the shoot.yaml?

No downtime is expected after executing a shoot.yaml update.