code: func handleAlphaNetworkTierGetError(err error) (string, error) {
  	if isForbidden(err) {
  		// Network tier is still an Alpha feature in GCP, and not every project
  		// is whitelisted to access the API. If we cannot access the API, just
  		// assume the tier is premium.
  		return cloud.NetworkTierDefault.ToGCEValue(), nil
  	}
  	// Can't get the network tier, just return an error.
  	return "", err
  }
docs: // TODO(#51665): Remove this once Network Tiers becomes Beta in GCP.