code: func (g *Cloud) getNetworkTierFromAddress(name, region string) (string, error) {
  	if !g.AlphaFeatureGate.Enabled(AlphaFeatureNetworkTiers) {
  		return cloud.NetworkTierDefault.ToGCEValue(), nil
  	}
  	addr, err := g.GetAlphaRegionAddress(name, region)
  	if err != nil {
  		return handleAlphaNetworkTierGetError(err)
  	}
  	return addr.NetworkTier, nil
  }
docs: // TODO(#51665): retire this function once Network Tiers becomes Beta in GCP.