code: func DeclareGRPCPortFlag(pluginName infra.PluginName) {
  	plugNameUpper := strings.ToUpper(string(pluginName))
  
  	usage := "Configure Agent' " + plugNameUpper + " net listener (port & timeouts); also set via '" +
  		plugNameUpper + config.EnvSuffix + "' env variable."
  	flag.String(grpcPortFlag(pluginName), "", usage)
  }
docs: // DeclareGRPCPortFlag declares GRPC port (with usage & default value) a flag for a particular plugin name