code: func dockerStatsToContainerStats(dockerStats *types.StatsJSON) (*ContainerStats, error) {
  	// The length of PercpuUsage represents the number of cores in an instance.
  	if len(dockerStats.CPUStats.CPUUsage.PercpuUsage) == 0 || numCores == uint64(0) {
  		seelog.Debug("Invalid container statistics reported, no cpu core usage reported")
  		return nil, fmt.Errorf("Invalid container statistics reported, no cpu core usage reported")
  	}
  
  	cpuUsage := dockerStats.CPUStats.CPUUsage.TotalUsage / numCores
  	memoryUsage := dockerStats.MemoryStats.Usage - dockerStats.MemoryStats.Stats["cache"]
  	return &ContainerStats{
  		cpuUsage:    cpuUsage,
  		memoryUsage: memoryUsage,
  		timestamp:   dockerStats.Read,
  	}, nil
  }
docs: // dockerStatsToContainerStats returns a new object of the ContainerStats object from docker stats.