disk label exceed max length with many etcd instances

[apeabody]

/kind bug

1. What kops version are you running? The command kops version, will display
this information.

2. What Kubernetes version are you running? kubectl version will print the
version if a cluster is running or provide the Kubernetes version specified as
a kops flag.

3. What cloud provider are you using?

4. What commands did you run? What is the simplest way to reproduce this issue?

I created a cluster with 7 control plane nodes, confirmed this works fine with <=5 control plane nodes.

5. What happened after the commands executed?

Setting labels on disk

"message": "Invalid value for field 'labels': ''. Label value '[SNIP]' violates format constraints. The value can only contain lowercase letters, numeric characters, underscores and dashes. The value can be at most 63 characters long. International characters are allowed."

Confirmed the k8s-io-etcd-events and k8s-io-etcd-main labels exceeded 63 characters.

6. What did you expect to happen?

7. Please provide your cluster manifest. Execute
kops get --name my.example.com -o yaml to display your cluster manifest.
You may want to remove your cluster name and other sensitive information.

8. Please run the commands with most verbose logging by adding the -v 10 flag.
Paste the logs into this report, or in a gist and provide the gist link here.

9. Anything else do we need to know?