Newly created google_compute_autoscaler has always default min_replicas

[tomplus]

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Terraform Version

Terraform v0.12.5

• provider.archive v1.3.0
• provider.google v2.19.0
• provider.google-beta v2.19.0
• provider.random v2.2.1

Affected Resource(s)

• google_compute_autoscaler

Terraform Configuration Files

resource "google_compute_autoscaler" "test" {
  provider = "google-beta"
  name     = "test"
  target   = "${google_compute_instance_group_manager.test.self_link}"
  zone     = var.zone
  project  = var.project

  autoscaling_policy {
    max_replicas    = 6
    min_replicas    = 0
    cooldown_period = 60

    metric {
      name                       = "pubsub.googleapis.com/subscription/num_undelivered_messages"
      filter                     = "resource.label.subscription_id = \"${var.queue_name}\" AND resource.type = \"pubsub_subscription\""
      single_instance_assignment = 1
    }
  }
}

Expected Behavior

The created resource should have min_replicas = 0.

Actual Behavior

The resource has min_replicas = 2 after creation. I have to run terraform apply again to fix this parameter.

      ~ autoscaling_policy {
            cooldown_period = 60
            max_replicas    = 6
          ~ min_replicas    = 2 -> 0

Steps to Reproduce

1. terraform apply

[tomplus]

Thank you.

[hixus]

Have the same issue. Running with TF_LOG=true it seems that terraform drops minNumReplicas from POST request if it's set to zero. Therefore autoscaler selects some minimum other than zero. Below post request body terraform made.

[DEBUG] plugin.terraform-provider-google-beta_v2.19.0_x4:
{
  "autoscalingPolicy": {
   "coolDownPeriodSec": 60,
   "customMetricUtilizations": [
    {
     "filter": "resource.type = pubsub_subscription AND resource.label.subscription_id = foobar",
     "metric": "pubsub.googleapis.com/subscription/num_undelivered_messages",
     "singleInstanceAssignment": 100
    }
   ],
   "maxNumReplicas": 1
  },
  "name": "foobar",
  "target": "https://www.googleapis.com/compute/beta/projects/foobar/zones/europe-north1-a/instanceGroupManagers/foobar-igm",
  "zone": "projects/foobar-258114/global/zones/europe-north1-a"
}```

[hixus]

Ok, this seems to be fixed but when does the fix come out?

[danawillow]

v2.20 (probably tomorrow)

[ghost]

I'm going to lock this issue because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.

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