Document versioning plan and upgrade recommendations

[robscott]

As we're thinking about the long term use of CRDs for this API, we'll want to ensure that both users and implementations have a smooth experience across CRD upgrades.

Here's a high level starting point based on discussions with folks from sig-apimachinery around the proper way to handle stored and served versions.

Minor release 1 (v0.5.0 for these resources):

• Release new API version (v1beta1)
• Leave old version as storage version (v1alpha2)
• Serve both API versions to simplify migration

Minor release 2 (v0.6.0 for these resources):

• Set new version as storage version (v1beta1)
• Stop serving old API version (v1alpha2)
• Recommend users run a tool such as kube-storage-version-migrator in their clusters if they have resources that were created with the alpha API

Minor release 3 or later (v0.7.0 for these resources):

• Remove old API version from the API

/assign

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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

This bot triages 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
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/close not-planned

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