code: func (a *Api) freeContainerMetrics(request *restful.Request, response *restful.Response) {
  	a.processMetricRequest(
  		core.NodeContainerKey(request.PathParameter("node-name"),
  			request.PathParameter("container-name"),
  		),
  		request, response)
  }
docs: // freeContainerMetrics returns a metric timeseries for a metric of the Container entity.
  // freeContainerMetrics addresses only free containers, by using the node-name/container-name path.