Activity Log alert exists for policy assignment deletion

# Activity Log alert for Policy Assignment deletion
resource "azurerm_monitor_activity_log_alert" "<example_resource_name>" {
  name                = "<example_resource_name>"
  resource_group_name = "<example_resource_name>"
  scopes              = ["/subscriptions/<example_resource_id>"]

  criteria {
    operation_name = "Microsoft.Authorization/policyAssignments/delete" # CRITICAL: alerts on policy assignment deletion
  }
}

// Activity Log alert for Policy Assignment deletion
resource alert 'Microsoft.Insights/activityLogAlerts@2020-10-01' = {
  name: '<example_resource_name>'
  location: 'Global'
  properties: {
    scopes: [
      '/subscriptions/<example_resource_id>'
    ]
    condition: {
      allOf: [
        {
          field: 'operationName'
          equals: 'Microsoft.Authorization/policyAssignments/delete' // CRITICAL: alerts on policy assignment deletion
        }
      ]
    }
    actions: {
      actionGroups: [] // Required property; empty keeps rule minimal
    }
  }
}