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