avm-tf-interfaces

name	avm-tf-interfaces
description	Use for AVM Terraform diagnostic settings, role assignments, locks, managed identities, private endpoints, customer-managed keys, tags, and AzAPI control interfaces.

AVM Terraform Interfaces

Read the current RMFR4, RMFR5, TFFR6, TFFR7, TFFR8, and TFNFR38 pages through https://azure.github.io/Azure-Verified-Modules/llms.txt.

Canonical utility module

Resource modules compose the canonical utility module instead of copying interface schemas:

module "avm_interfaces" {
  source  = "Azure/avm-utl-interfaces/azure"
  version = "~> 0.6"

  diagnostic_settings_v2 = var.diagnostic_settings
  managed_identities     = var.managed_identities
}

Only pass inputs supported by the resource. Keep the utility version constraint current with the specification and Registry release.

Resource-feature interfaces

Expose an interface only when the Azure resource supports the capability:

Interface	Consumer variable	Purpose
Diagnostic settings	diagnostic_settings	Route logs and metrics to supported destinations.
Role assignments	role_assignments	Create RBAC assignments scoped to the resource.
Locks	lock	Apply an optional CanNotDelete or ReadOnly management lock.
Managed identities	managed_identities	Configure system-assigned and user-assigned identities.
Private endpoints	private_endpoints	Create private endpoints and optional DNS-zone integration.
Customer-managed key	customer_managed_key	Configure supported CMK encryption.
Tags	tags	Apply tags to resources that support them.

Do not expose a no-op interface or rename a standard variable.

Diagnostic settings v2

New modules use:

• utility input diagnostic_settings_v2; and
• utility output diagnostic_settings_azapi_v2.

The v2 shape supports log category or category group, metrics, enabled flags, and retention policy objects. Do not restrict category values because Azure can add categories.

The owning module supplies scope and all TFFR4-TFFR8 controls:

resource "azapi_resource" "diagnostic_settings" {
  for_each = module.avm_interfaces.diagnostic_settings_azapi_v2

  type      = var.resource_types.insights_diagnostic_settings
  name      = each.value.name
  parent_id = azapi_resource.this.id
  body      = each.value.body

  ignore_body_changes    = length(var.ignore_body_changes.insights_diagnostic_settings) > 0 ? var.ignore_body_changes.insights_diagnostic_settings : null
  replace_triggers_refs  = []
  response_export_values = []
  retry                  = var.retry

  dynamic "timeouts" {
    for_each = var.timeouts == null ? [] : [var.timeouts]
    content {
      create = timeouts.value.create
      read   = timeouts.value.read
      update = timeouts.value.update
      delete = timeouts.value.delete
    }
  }
}

Do not use the utility module's legacy diagnostic-settings input or output in new code.

AzAPI control interfaces

These apply to every AzAPI resource, independently of optional resource features:

resource_types

The object contains one deterministic key per AzAPI resource and nested objects matching submodules. Each owning module defines its own tested API-version defaults. Parent slots do not repeat child string defaults.

retry and timeouts

Expose the TFFR7 object shapes. Apply both to every AzAPI resource and cascade them unchanged to every submodule:

retry = var.retry

dynamic "timeouts" {
  for_each = var.timeouts == null ? [] : [var.timeouts]
  content {
    create = timeouts.value.create
    read   = timeouts.value.read
    update = timeouts.value.update
    delete = timeouts.value.delete
  }
}

ignore_body_changes

Expose one optional(list(string), []) field per owned AzAPI resource and one nested child-shaped object per submodule. Apply the matching field and collapse an empty list to null:

ignore_body_changes = length(var.ignore_body_changes.example_widgets) > 0 ? var.ignore_body_changes.example_widgets : null

Pass only the matching nested slot to a child. Do not cascade the parent's path list unchanged because paths are specific to one resource body.

Paths use body-relative dot notation. Individual list indices cannot be targeted. Ignored configuration is not sent to Azure until the path is removed, and interface changes take effect only after apply.

Resource ID validation

Validate standard interface resource IDs with TFNFR38 where each field has one expected resource type:

validation {
  condition = alltrue([
    for endpoint in values(var.private_endpoints) :
    can(provider::azapi::parse_resource_id("Microsoft.Network/virtualNetworks/subnets", endpoint.subnet_resource_id))
  ])
  error_message = "Each subnet_resource_id must be a valid subnet resource ID."
}

Handle nullable values and collections explicitly. If a field legitimately accepts unrelated resource types, do not validate it against one arbitrary type.

Composition rules

• Implement locks, role assignments, diagnostic settings, private endpoints, and other child or extension resources as distinct, descriptively named resources or required submodules.
• Keep the primary resource label this.
• Source every AzAPI type from var.resource_types.
• Apply response_export_values, replace_triggers_refs, retry, timeouts, and ignore_body_changes to every AzAPI resource.
• Use unquoted lifecycle references such as ignore_changes = [name].
• Do not create destination workspaces, virtual networks, subnets, key vaults, or other consumer-owned dependencies inside a resource module.
• Keep standard collection inputs non-null with empty defaults.

Consult the Azure/avm-utl-interfaces/azure release documentation for exact feature-interface schemas and outputs. Do not reconstruct them from memory.