code: func (lr *logRegistry) Lookup(loggerName string) (logger logging.Logger, found bool) {
  	loggerInt, found := lr.loggers.Load(loggerName)
  	if !found {
  		return nil, false
  	}
  	logger, ok := loggerInt.(*Logger)
  	if ok {
  		return logger, found
  	}
  	panic(fmt.Errorf("cannot cast log value to Logger obj"))
  }
docs: // Lookup returns a logger instance identified by name from registry