code: func (g *Cloud) CreateRegionForwardingRule(rule *compute.ForwardingRule, region string) error {
  	ctx, cancel := cloud.ContextWithCallTimeout()
  	defer cancel()
  
  	mc := newForwardingRuleMetricContext("create", region)
  	return mc.Observe(g.c.ForwardingRules().Insert(ctx, meta.RegionalKey(rule.Name, region), rule))
  }
docs: // CreateRegionForwardingRule creates and returns a
  // RegionalForwardingRule that points to the given BackendService