New Rsource: azurerm_virtual_machine_scale_set_managed_disk

[ziyeqf]

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Description

add a new managed disk resource to support managed disk attached to VMSS.
The existing resource azurerm_managed_disk by design does not support disk attached to a VMSS. e.g.: some properties requires the disk to be detached when it's attached to VMSS, but requires restart when it's attached to a VM. accroding to the comment #25582 (comment), adding a new resource instead of implementing this kind of logic in the existing resource.

PR Checklist

• I have followed the guidelines in our Contributing Documentation.
• I have checked to ensure there aren't other open Pull Requests for the same update/change.
• I have checked if my changes close any open issues. If so please include appropriate closing keywords below.
• I have updated/added Documentation as required written in a helpful and kind way to assist users that may be unfamiliar with the resource / data source.
• I have used a meaningful PR title to help maintainers and other users understand this change and help prevent duplicate work.
  For example: “resource_name_here - description of change e.g. adding property new_property_name_here”

Changes to existing Resource / Data Source

• I have added an explanation of what my changes do and why I'd like you to include them (This may be covered by linking to an issue above, but may benefit from additional explanation).
• I have written new tests for my resource or datasource changes & updated any relevant documentation.
• I have successfully run tests with my changes locally. If not, please provide details on testing challenges that prevented you running the tests.
• (For changes that include a state migration only). I have manually tested the migration path between relevant versions of the provider.

Testing

• My submission includes Test coverage as described in the Contribution Guide and the tests pass. (if this is not possible for any reason, please include details of why you did or could not add test coverage)

in progress

Change Log

Below please provide what should go into the changelog (if anything) conforming to the Changelog Format documented here.

• New Rsource: azurerm_virtual_machine_scale_set_managed_disk [GH-00000]

This is a (please select all that apply):

• Bug Fix
• New Feature (ie adding a service, resource, or data source)
• Enhancement
• Breaking Change

Related Issue(s)

Fixes #26651
Fixes #14617

AI Assistance Disclosure

• AI Assisted - This contribution was made by, or with the assistance of, AI/LLMs

Rollback Plan

If a change needs to be reverted, we will publish an updated version of the provider.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

Note

If this PR changes meaningfully during the course of review please update the title and description as required.

[ziyeqf]

/test -b

[Copilot]

Pull request overview

This PR introduces a new Terraform resource (azurerm_virtual_machine_scale_set_managed_disk) intended to manage Azure Managed Disks that may be attached to Virtual Machine Scale Set (VMSS) instances, enabling updates that would otherwise fail with azurerm_managed_disk when a disk is attached to a VMSS VM.

Changes:

• Adds the new azurerm_virtual_machine_scale_set_managed_disk resource implementation, including hot-detach/update/reattach logic for VMSS instance-attached disks.
• Adds a corresponding list resource implementation and acceptance tests (including identity + “attached to VMSS instance” behavior coverage).
• Adds docs + name validation helper for Managed Disk names and updates issue triage labeler patterns.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
website/docs/r/virtual_machine_scale_set_managed_disk.html.markdown	New resource documentation for VMSS-managed disk behavior and arguments.
website/docs/list-resources/virtual_machine_scale_set_managed_disk.html.markdown	Adds list-resource documentation for the new resource type.
internal/services/compute/virtual_machine_scale_set_managed_disk_resource.go	Core resource implementation, including update-with-detach workflow.
internal/services/compute/virtual_machine_scale_set_managed_disk_resource_test.go	Acceptance tests for basic/complete/update/validation behaviors.
internal/services/compute/virtual_machine_scale_set_managed_disk_resource_list.go	List resource implementation for enumerating disks.
internal/services/compute/virtual_machine_scale_set_managed_disk_resource_list_test.go	Acceptance test coverage for list/query behavior.
internal/services/compute/virtual_machine_scale_set_managed_disk_resource_identity_gen_test.go	Generated acceptance test validating resource identity fields.
internal/services/compute/virtual_machine_scale_set_managed_disk_attached_resource_test.go	Acceptance test proving hot-detach/update/reattach behavior when attached to a VMSS instance.
internal/services/compute/validate/managed_disk_name.go	Adds Managed Disk name validation helper.
internal/services/compute/validate/managed_disk_name_test.go	Unit tests for Managed Disk name validation.
internal/services/compute/resource_names.go	Adds VirtualMachineScaleSetResourceName constant used for locking.
internal/services/compute/registration.go	Registers the new resource and list resource with the compute service.
.github/labeler-issue-triage.yml	Updates issue triage labeler to recognize the new resource name.

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[ziyeqf]

/test -b

[ziyeqf]

/test -b

[ziyeqf]

/test -b

[hc-github-team-tf-azure]

Build: 700107
PR: #32715

Total: 11
Passed: 11
Failed: 0
Test Duration: 0h 7m 35s

Test Details

Status	Test Name	Duration
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_validationErrors	48.846s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_list	86.964s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_requiresImport	141.181s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_resourceIdentity	173.363s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_complete	186.434s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_basic	187.506s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_diskSizeCannotShrink	188.76s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_ultraSSD	231.962s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_update	233.196s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_osTypeUpdate	235.26s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_encryptionSettings	314.249s

[hc-github-team-tf-azure]

Testing in Beta version enabled

Build: 700108
PR: #32715

Total: 12
Passed: 12
Failed: 0
Test Duration: 0h 16m 37s

Test Details

Status	Test Name	Duration
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_validationErrors	41.227s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_list	78.089s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_requiresImport	155.647s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_resourceIdentity	170.067s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_complete	179.927s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_basic	180.492s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_diskSizeCannotShrink	181.581s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_ultraSSD	224.247s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_update	228.572s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_osTypeUpdate	228.953s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_encryptionSettings	310.762s
✅ PASS	TestAccVirtualMachineScaleSetManagedDisk_attachedToScaleSetInstanceResize	326.937s

[ziyeqf]

/test

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TeamCity build triggered:

• compute: #732582