diff --git a/modules/compute-mig/README.md b/modules/compute-mig/README.md
index b281c2e3..5e3dbd8e 100644
--- a/modules/compute-mig/README.md
+++ b/modules/compute-mig/README.md
@@ -389,7 +389,6 @@ module "nginx-mig" {
 # tftest modules=2 resources=3 inventory=stateful.yaml
 ```
 <!-- BEGIN TFDOC -->
-
 ## Variables
 
 | name | description | type | required | default |
@@ -400,7 +399,7 @@ module "nginx-mig" {
 | [project_id](variables.tf#L198) | Project id. | <code>string</code> | ✓ |  |
 | [all_instances_config](variables.tf#L17) | Metadata and labels set to all instances in the group. | <code title="object&#40;&#123;&#10;  labels   &#61; optional&#40;map&#40;string&#41;&#41;&#10;  metadata &#61; optional&#40;map&#40;string&#41;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
 | [auto_healing_policies](variables.tf#L26) | Auto-healing policies for this group. | <code title="object&#40;&#123;&#10;  health_check      &#61; optional&#40;string&#41;&#10;  initial_delay_sec &#61; number&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
-| [autoscaler_config](variables.tf#L35) | Optional autoscaler configuration. | <code title="object&#40;&#123;&#10;  max_replicas    &#61; number&#10;  min_replicas    &#61; number&#10;  cooldown_period &#61; optional&#40;number&#41;&#10;  mode            &#61; optional&#40;string&#41; &#35; OFF, ONLY_UP, ON&#10;  scaling_control &#61; optional&#40;object&#40;&#123;&#10;    down &#61; optional&#40;object&#40;&#123;&#10;      max_replicas_fixed   &#61; optional&#40;number&#41;&#10;      max_replicas_percent &#61; optional&#40;number&#41;&#10;      time_window_sec      &#61; optional&#40;number&#41;&#10;    &#125;&#41;&#41;&#10;    in &#61; optional&#40;object&#40;&#123;&#10;      max_replicas_fixed   &#61; optional&#40;number&#41;&#10;      max_replicas_percent &#61; optional&#40;number&#41;&#10;      time_window_sec      &#61; optional&#40;number&#41;&#10;    &#125;&#41;&#41;&#10;  &#125;&#41;, &#123;&#125;&#41;&#10;  scaling_signals &#61; optional&#40;object&#40;&#123;&#10;    cpu_utilization &#61; optional&#40;object&#40;&#123;&#10;      target                &#61; number&#10;      optimize_availability &#61; optional&#40;bool&#41;&#10;    &#125;&#41;&#41;&#10;    load_balancing_utilization &#61; optional&#40;object&#40;&#123;&#10;      target &#61; number&#10;    &#125;&#41;&#41;&#10;    metrics &#61; optional&#40;list&#40;object&#40;&#123;&#10;      name                       &#61; string&#10;      type                       &#61; string &#35; GAUGE, DELTA_PER_SECOND, DELTA_PER_MINUTE&#10;      target_value               &#61; number&#10;      single_instance_assignment &#61; optional&#40;number&#41;&#10;      time_series_filter         &#61; optional&#40;string&#41;&#10;    &#125;&#41;&#41;&#41;&#10;    schedules &#61; optional&#40;list&#40;object&#40;&#123;&#10;      duration_sec          &#61; number&#10;      name                  &#61; string&#10;      min_required_replicas &#61; number&#10;      cron_schedule         &#61; string&#10;      description           &#61; optional&#40;bool&#41;&#10;      timezone              &#61; optional&#40;string&#41;&#10;      disabled              &#61; optional&#40;bool&#41;&#10;    &#125;&#41;&#41;&#41;&#10;  &#125;&#41;, &#123;&#125;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
+| [autoscaler_config](variables.tf#L35) | Optional autoscaler configuration. | <code title="object&#40;&#123;&#10;  max_replicas    &#61; number&#10;  min_replicas    &#61; number&#10;  cooldown_period &#61; optional&#40;number&#41;&#10;  mode            &#61; optional&#40;string&#41; &#35; OFF, ONLY_UP, ON&#10;  scaling_control &#61; optional&#40;object&#40;&#123;&#10;    down &#61; optional&#40;object&#40;&#123;&#10;      max_replicas_fixed   &#61; optional&#40;number&#41;&#10;      max_replicas_percent &#61; optional&#40;number&#41;&#10;      time_window_sec      &#61; optional&#40;number&#41;&#10;    &#125;&#41;&#41;&#10;    in &#61; optional&#40;object&#40;&#123;&#10;      max_replicas_fixed   &#61; optional&#40;number&#41;&#10;      max_replicas_percent &#61; optional&#40;number&#41;&#10;      time_window_sec      &#61; optional&#40;number&#41;&#10;    &#125;&#41;&#41;&#10;  &#125;&#41;, &#123;&#125;&#41;&#10;  scaling_signals &#61; optional&#40;object&#40;&#123;&#10;    cpu_utilization &#61; optional&#40;object&#40;&#123;&#10;      target                &#61; number&#10;      optimize_availability &#61; optional&#40;bool&#41;&#10;    &#125;&#41;&#41;&#10;    load_balancing_utilization &#61; optional&#40;object&#40;&#123;&#10;      target &#61; number&#10;    &#125;&#41;&#41;&#10;    metrics &#61; optional&#40;list&#40;object&#40;&#123;&#10;      name                       &#61; string&#10;      type                       &#61; optional&#40;string&#41; &#35; GAUGE, DELTA_PER_SECOND, DELTA_PER_MINUTE&#10;      target_value               &#61; optional&#40;number&#41;&#10;      single_instance_assignment &#61; optional&#40;number&#41;&#10;      time_series_filter         &#61; optional&#40;string&#41;&#10;    &#125;&#41;&#41;&#41;&#10;    schedules &#61; optional&#40;list&#40;object&#40;&#123;&#10;      duration_sec          &#61; number&#10;      name                  &#61; string&#10;      min_required_replicas &#61; number&#10;      cron_schedule         &#61; string&#10;      description           &#61; optional&#40;bool&#41;&#10;      timezone              &#61; optional&#40;string&#41;&#10;      disabled              &#61; optional&#40;bool&#41;&#10;    &#125;&#41;&#41;&#41;&#10;  &#125;&#41;, &#123;&#125;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
 | [default_version_name](variables.tf#L83) | Name used for the default version. | <code>string</code> |  | <code>&#34;default&#34;</code> |
 | [description](variables.tf#L89) | Optional description used for all resources managed by this module. | <code>string</code> |  | <code>&#34;Terraform managed.&#34;</code> |
 | [distribution_policy](variables.tf#L95) | DIstribution policy for regional MIG. | <code title="object&#40;&#123;&#10;  target_shape &#61; optional&#40;string&#41;&#10;  zones        &#61; optional&#40;list&#40;string&#41;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>null</code> |
@@ -422,5 +421,4 @@ module "nginx-mig" {
 | [group_manager](outputs.tf#L26) | Instance group resource. |  |
 | [health_check](outputs.tf#L35) | Auto-created health-check resource. |  |
 | [id](outputs.tf#L44) | Fully qualified group manager id. |  |
-
 <!-- END TFDOC -->
diff --git a/modules/compute-mig/variables.tf b/modules/compute-mig/variables.tf
index 30f2ce96..20864d18 100644
--- a/modules/compute-mig/variables.tf
+++ b/modules/compute-mig/variables.tf
@@ -61,8 +61,8 @@ variable "autoscaler_config" {
       }))
       metrics = optional(list(object({
         name                       = string
-        type                       = string # GAUGE, DELTA_PER_SECOND, DELTA_PER_MINUTE
-        target_value               = number
+        type                       = optional(string) # GAUGE, DELTA_PER_SECOND, DELTA_PER_MINUTE
+        target_value               = optional(number)
         single_instance_assignment = optional(number)
         time_series_filter         = optional(string)
       })))