code: func New(cfg Collector, nodeInfo collectors.NodeInfo, ctr *mesosAgent.ContainerTaskRels) (Collector, chan producers.MetricsMessage) {
  	c := cfg
  	c.nodeInfo = nodeInfo
  	c.metricsChan = make(chan producers.MetricsMessage)
  	c.containerTaskRels = ctr
  	return c, c.metricsChan
  }
docs: // New returns a new instance of the framework collector.