logging.go
func (logger *Logger) Debugf(format string, a ...interface{}) {
	logger.log(DEBUG, format, a...)
}
func (logger *Logger) Debugf(format string, a ...interface{}) {
	logger.log(DEBUG, format, a...)
}
func ( logger * Logger ) Debugf ( format string , a ... interface { } ) { logger . log ( DEBUG , format , a ... ) }
// Debugf logs provided message with formatting in DEBUG level.
Debugf logs provided message with formatting in DEBUG level .