Remove high availability yaml for < 1.21

[rittneje]

metrics-server has not supported a Kubernetes version less than 1.21 since v0.6. Consequently, there does not seem to be any need to have both high-availability-1.21+.yaml and high-availability.yaml release assets anymore.

[Dean-Coakley]

I would be open to sending a PR for this.

@dgrisonnet would you be open to accepting this change? Would you also like any changes to the compatibility matrix https://github.com/kubernetes-sigs/metrics-server/tree/master?tab=readme-ov-file#compatibility-matrix Maybe it just makes sense to include the latest 3 releases or so?

[k8s-triage-robot]

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/lifecycle stale

[rittneje]

/remove-lifecycle stale

[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all issues.

This bot triages un-triaged issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Mark this issue as fresh with /remove-lifecycle stale
• Close this issue with /close
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/lifecycle stale

[rittneje]

/remove-lifecycle stale

[dgrisonnet]

@Dean-Coakley yes both updating the compatibility matrix and the assets sounds like good improvements. Are you still interested in contributing this change?

/triage accepted