code: func (o *Options) loadConfigFromFile(file string) (*kubeproxyconfig.KubeProxyConfiguration, error) {
  	data, err := ioutil.ReadFile(file)
  	if err != nil {
  		return nil, err
  	}
  
  	return o.loadConfig(data)
  }
docs: // loadConfigFromFile loads the contents of file and decodes it as a
  // KubeProxyConfiguration object.