code: func SetAllLoggers(lvl logging.Level) {
  	logging.SetLevel(lvl, "")
  
  	loggerMutex.RLock()
  	defer loggerMutex.RUnlock()
  
  	for n := range loggers {
  		logging.SetLevel(lvl, n)
  	}
  }
docs: // SetAllLoggers changes the logging.Level of all loggers to lvl