Feature Gates

[erictune]

Core Kubernetes types have Feature Gates.
They are documented here: https://kubernetes.io/docs/reference/command-line-tools-reference/feature-gates/

This is a good practice for anyone, whether they are building a CRD as part of the K8s org, or their own API.

Sadly, CRDs don't have feature gate support built into them.

KubeBuilder could close this gap. It could provide a feature-gate feature.
It might work like this:

• Developer tags a field in an API as belonging to a feature gate, like `// +feature-gate the-new-hotness
• KB (or controller-runtime or controller-tools) makes your controller binary have a --feature-gates flag.
• all "gate names" mentioned in tags are added as valid comma-separated arguments to --feature-gates flag.
• When installing the CRD, controller-tools will blank out disabled parts of the schema. This causes pruning to prune them.
• Generated documentation lists the supported feature gate strings.

/kind feature

[fejta-bot]

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[DirectXMan12]

/lifecycle frozen

[camilamacedo86]

It is related to: kubernetes-sigs/controller-tools#600
Also, if you would like to understand more about the use cases see: https://www.youtube.com/watch?v=AJa2B-twtG4