code: func (api *API) StatsWithTags(tags []string) stats.StatsClient {
  	if api.holder == nil || api.cluster == nil {
  		return nil
  	}
  	return api.holder.Stats.WithTags(tags...)
  }
docs: // StatsWithTags returns an instance of whatever implementation of StatsClient
  // pilosa is using with the given tags.