google_compute_instance_group_manager

resource "google_compute_instance_group_manager" "${MyResource}" {
   name = "example-name"
   description = "example-description"
   base_instance_name = "example-base_instance_name"
   instance_template = "\${google_compute_instance_template.foobar.self_link}"
   zone = "us-central1-a"
}