Crash: Empty target_size block definition inside version block in google_compute_region_instance_group_manager

[amontalban]

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Terraform Version

Terraform v0.14.6
+ provider registry.terraform.io/hashicorp/google v3.57.0

Affected Resource(s)

• google_compute_region_instance_group_manager

Terraform Configuration Files

resource "google_compute_region_instance_group_manager" "default" {
  name = "test"
  base_instance_name = "tests-igm"

  region                    = "us-central1"
  distribution_policy_zones = ["us-central1-a", "us-central1-f"]
  description               = "Testing"

  target_size        = 2
  wait_for_instances = false

  version {
    name              = "default"
    instance_template = google_compute_instance_template.default.id

    target_size {
    }
  }
}

resource "google_compute_instance_template" "default" {
  can_ip_forward = false
  name_prefix  = "default-instance-template"
  description  = "Example instance template"

  enable_display = false
  labels = {
    "environment" = "dev"
  }
  machine_type = "e2-medium"
  metadata = {
    "foo"            = "bar"
    "startup-script" = <<-EOT
            #!/bin/bash
            apt-get install -y nginx
        EOT
  }

  disk {
    auto_delete  = true
    boot         = true
    source_image = "https://www.googleapis.com/compute/v1/projects/ubuntu-os-cloud/global/images/ubuntu-2004-focal-v20200729"
  }

  network_interface {
    network = "default"
  }
}

Debug Output

https://gist.github.com/amontalban/af0c3e5001c14f69b38a5db1eba04cbd

Panic Output

https://gist.github.com/amontalban/af0c3e5001c14f69b38a5db1eba04cbd

Expected Behavior

To avoid crashing, I assume the problem is with the empty target_size block.

Actual Behavior

Steps to Reproduce

1. terraform apply

Important Factoids

References

[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.

If you feel this issue should be reopened, we encourage creating a new issue linking back to this one for added context. If you feel I made an error 🤖 🙉 , please reach out to my human friends 👉 hashibot-feedback@hashicorp.com. Thanks!