code: func (l *CallerInfo) getDefaultCallerInfoSetting() map[callerInfoKey]bool {
  	return map[callerInfoKey]bool{
  		{"", api.CRITICAL}: true,
  		{"", api.ERROR}:    true,
  		{"", api.WARNING}:  true,
  		{"", api.INFO}:     true,
  		{"", api.DEBUG}:    true,
  	}
  }
docs: //getDefaultCallerInfoSetting default setting for callerinfo