Did you ever wonder how to get informed when Nagios doesn't run anymore?

Just use this line...

OUT=/usr/lib/nagios/plugins/check_nagios -F /var/cache/nagios3/status.dat -e 1 -C nagios3|| echo $OUT | /usr/bin/mail -s "[NAGIOS] Nagios LogFile STALE" spambox@....com

... called once an hour by Cron and you will at least get informed.