The audit information logged includes shutdowns and startups of JUNOS. This in turn identifies the the shutdown and startup events of the audit system, which cannot be independently disbaled or enabled. For example, if JUNOS is restarted, the audit log contains the following information:
Dec 20 23:17:35 bilbo syslogd: exiting on signal 14 Dec 20 23:17:35 bilbo syslogd: restart Dec 20 23:17:35 bilbo syslogd /kernel: Dec 20 23:17:35 init: syslogd (PID 19128) exited with status=1 Dec 20 23:17:42 bilbo /kernel: Dec 20 23:17:53 init: syslogd (PID 19200) started