Add microsoft.virtualnodes to the list of allowed extension types.

[tomaandreisacuiu]

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Pull request overview

This PR updates the aks-preview extension to allow microsoft.virtualnodes as an accepted Kubernetes extension type, and bumps the extension version to publish that change.

Changes:

• Add microsoft.virtualnodes to the extension-type allow list used by az aks extension validation.
• Bump aks-preview extension version from 21.0.0b8 to 21.0.0b9.
• Record the change in HISTORY.rst for the new version.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/aks-preview/azext_aks_preview/_helpers.py	Extends the allow list to include microsoft.virtualnodes for extension-type validation.
src/aks-preview/setup.py	Bumps the extension package version to 21.0.0b9.
src/aks-preview/HISTORY.rst	Adds the 21.0.0b9 changelog entry describing the allow-list update.

[yonzhan]

AKS

[FumingZhang]

Could you expand the PR description with a bit of context on microsoft.virtualnodes — what this extension does and why it's being added to the allow-list now? A link to the extension type docs / onboarding issue would also help future readers understand the intent. If there's a customer-facing usage flow (e.g. the az aks extension create ... --extension-type microsoft.virtualnodes command), a one-line example in the description would be great too.

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[FumingZhang]

Could you expand the PR description with a bit of context on microsoft.virtualnodes — what this extension does and why it's being added to the allow-list now? A link to the extension type docs / onboarding issue would also help future readers understand the intent. If there's a customer-facing usage flow (e.g. the az aks extension create ... --extension-type microsoft.virtualnodes command), a one-line example in the description would be great too.

If this is not applicable, please add a new scenario test case to make sure the new extension could work as expected.