Add reference for `KUBERNETES_EXEC_INFO`

[sftim]

This is a Feature Request

What would you like to be added Kubernetes can set an environment variable, KUBERNETES_EXEC_INFO. See https://k8s.io/docs/reference/access-authn-authz/authentication/#client-go-credential-plugins

I'd like us to have documentation for what the contents of that variable are and what other parties should expect.

Why is this needed

• This would help people write authentication plugins
• This would help people implement Kubernetes client libraries
• This would help people implement single-purpose Kubernetes client software

Comments I spotted the lack of docs when trying to troubleshoot a subcommand of the aws CLI tool.

/language en I'm not sure which SIG would own this.

[mehabhalodiya]

/triage accepted

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/lifecycle stale

[vaibhav2107]

/remove-lifecycle stale

[sftim]

/lifecycle frozen

[sftim]

/retitle Add reference for KUBERNETES_EXEC_INFO

[k8s-triage-robot]

This issue has not been updated in over 1 year, and should be re-triaged.

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• Confirm that this issue is still relevant with /triage accepted (org members only)
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/remove-triage accepted

[sftim]

/triage accepted

IMO