code: func (ic *InstanceCount) AddCreated(n int, project, zone string) {
  	for i, c := range ic.Created {
  		if c.Project == project && c.Zone == zone {
  			ic.Created[i].Count += n
  			return
  		}
  	}
  	ic.Created = append(ic.Created, createdCount{
  		Count:   n,
  		Project: project,
  		Zone:    zone,
  	})
  }
docs: // AddCreated increments the count of created VMs for the given project and
  // zone.