code: func (g *GRPCLogger) V(l int) bool {
  	switch g.level {
  	case "TRACE":
  		// Enable ALL the verbosity!
  		return true
  	case "DEBUG":
  		return l < 2
  	case "INFO":
  		return l < 1
  	default:
  		return false
  	}
  }
docs: // V implements grpclog.LoggerV2