code: func checkClockDrift() {
  	drift, err := sntpDrift(ntpChecks)
  	if err != nil {
  		return
  	}
  	if drift < -driftThreshold || drift > driftThreshold {
  		warning := fmt.Sprintf("System clock seems off by %v, which can prevent network connectivity", drift)
  		howtofix := fmt.Sprintf("Please enable network time synchronisation in system settings")
  		separator := strings.Repeat("-", len(warning))
  
  		log.Warn(separator)
  		log.Warn(warning)
  		log.Warn(howtofix)
  		log.Warn(separator)
  	} else {
  		log.Debug(fmt.Sprintf("Sanity NTP check reported %v drift, all ok", drift))
  	}
  }
docs: // checkClockDrift queries an NTP server for clock drifts and warns the user if
  // one large enough is detected.