tp-cloud/terraform/modules/network/outputs.tf

# Output
output "vpc_id" {
  value = google_compute_network.vpc.id
}

output "subnet_id" {
  value = {
    frontend = google_compute_subnetwork.frontend.id,
    backend = google_compute_subnetwork.backend.id,
    database = google_compute_subnetwork.database.id
  }
}