See the Monitoring Options page for further information. The default for this flag is enable . This command controls the amount and type of output written to the system syslog facility or the alternate logfile log file. By default, all output is turned on. Within these classes four types of messages can be controlled.
Statistical output is controlled with the statistics keyword.
The final message group is the status messages. This describes mainly the synchronizations status. Configuration keywords are formed by concatenating the message class with the event class. The all prefix can be used instead of a message class. This would just list the synchronizations state of ntpd and the major system events.