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