code: func NewDockerStatsEngine(cfg *config.Config, client dockerapi.DockerClient, containerChangeEventStream *eventstream.EventStream) *DockerStatsEngine {
  	return &DockerStatsEngine{
  		client:                       client,
  		resolver:                     nil,
  		disableMetrics:               cfg.DisableMetrics,
  		tasksToContainers:            make(map[string]map[string]*StatsContainer),
  		tasksToHealthCheckContainers: make(map[string]map[string]*StatsContainer),
  		tasksToDefinitions:           make(map[string]*taskDefinition),
  		containerChangeEventStream:   containerChangeEventStream,
  	}
  }
docs: // NewDockerStatsEngine creates a new instance of the DockerStatsEngine object.
  // MustInit() must be called to initialize the fields of the new event listener.