The docs talking about VerticalPodAutoscaler .spec.updatePolicy.updateMode list a number of options for the value that are all listed in lower case.  However, using the lower case value will result in an error.  This appears to be confirmed by the upstream const definitions shown here: https://github.com/kubernetes/autoscaler/blob/master/vertical-pod-autoscaler/pkg/apis/autoscaling.k8s.io/v1/types.go#L157-L174

OCP 4.12 - Current.  Also appears as far back as 4.5

    Always

    Create a VPA as

apiVersion: autoscaling.k8s.io/v1
kind: VerticalPodAutoscaler
metadata:
  name: vpa-recommnender
spec:
  targetRef:
    apiVersion: "apps/v1"
    kind:       DaemonSet
    name:       datadog
  updatePolicy:
    updateMode: "off"

    Error from server: error when creating "dd-vpa.yam": admission webhook "vpa.k8s.io" denied the request: unexpected UpdateMode value off

    vertical pod autoscaler to be created as implied by the docs.

    changing "off" to "Off" produces the expected result