Annotation used to exclude Nodes from the autoscaler check uses invalid key

[brydoncheyney]

Which component are you using?: cluster-autoscaler

What version of the component are you using?: HEAD (feature is unreleased)

Component version: HEAD

What k8s version are you using (kubectl version)?: EKS 1.28

kubectl version Output

$ kubectl version
Client Version: version.Info{Major:"1", Minor:"27", GitVersion:"v1.27.4", GitCommit:"fa3d7990104d7c1f16943a67f11b154b71f6a132", GitTreeState:"clean", BuildDate:"2023-07-19T12:14:48Z", GoVersion:"go1.20.6", Compiler:"gc", Platform:"darwin/arm64"}
Kustomize Version: v5.0.1
Server Version: version.Info{Major:"1", Minor:"28+", GitVersion:"v1.28.3-eks-4f4795d", GitCommit:"e77944ea667aee90c84c48a74a2a0da7a23e0508", GitTreeState:"clean", BuildDate:"2023-10-20T23:21:39Z", GoVersion:"go1.20.10", Compiler:"gc", Platform:"linux/amd64"}

What environment is this in?: AWS

What did you expect to happen?:

Applying the annotation to Nodes would reduce the levels of redundant messaging in the controller

What happened instead?:

Annotation could not be applied.

How to reproduce it (as minimally and precisely as possible):

; k patch node ip-XXX-XXX-XXX-XXX.ec2.internal --patch '{"metadata": {"annotations": {"k8s.io/cluster-autoscaler/enabled": "false"}}}'
The Node "ip-XXX-XXX-XXX-XXX.ec2.internal" is invalid: metadata.annotations: Invalid value: "k8s.io/cluster-autoscaler/enabled": a qualified name must consist of alphanumeric characters, '-', '_' or '.', and must start and end with an alphanumeric character (e.g. 'MyName',  or 'my.name',  or '123-abc', regex used for validation is '([A-Za-z0-9][-A-Za-z0-9_.]*)?[A-Za-z0-9]') with an optional DNS subdomain prefix and '/' (e.g. 'example.com/MyName')

Anything else we need to know?: