agent/logger/log.go
func ForModule(module string) OldLogger {
	once.Do(initLogger)
	return logger.New("module", module)
}
func ForModule(module string) OldLogger {
	once.Do(initLogger)
	return logger.New("module", module)
}
// ForModule returns an OldLogger instance.  OldLogger is deprecated and kept
// for compatibility reasons.  Prefer using Seelog directly.