code: func NewLoadavgCollector() (Collector, error) {
  	return &loadavgCollector{
  		metric: []typedDesc{
  			{prometheus.NewDesc(namespace+"_load1", "1m load average.", nil, nil), prometheus.GaugeValue},
  			{prometheus.NewDesc(namespace+"_load5", "5m load average.", nil, nil), prometheus.GaugeValue},
  			{prometheus.NewDesc(namespace+"_load15", "15m load average.", nil, nil), prometheus.GaugeValue},
  		},
  	}, nil
  }
docs: // NewLoadavgCollector returns a new Collector exposing load average stats.