code: func (daemon *Daemon) reloadFeatures(conf *config.Config, attributes map[string]string) {
  	// update corresponding configuration
  	// note that we allow features option to be entirely unset
  	daemon.configStore.Features = conf.Features
  
  	// prepare reload event attributes with updatable configurations
  	attributes["features"] = fmt.Sprintf("%v", daemon.configStore.Features)
  }
docs: // reloadFeatures updates configuration with enabled/disabled features