what is nagios 'SECURITY information'?

[Alex Dean]

I have Nagios running on a local server, and I occasionally get some emails from it with the subject "*** SECURITY information for <hostname>***".  The body of the message is just a few characters.  I've done some searching in my Nagios logs and online, and I have no idea what these emails are or what they mean.

The latest instance was last night.  I had my local network torn apart for a few hours, and when I reconnected everything, I had about 40 of these emails waiting for me.

The Nagios I'm using is from Ubuntu 9.10.  I'm using only a very few HTTP, ssh, & ping monitors.  Nothing complex at all.

alex at artichoke:~$ cat /etc/issue
Ubuntu 9.10 \n \l

alex at artichoke:~$ dpkg --list | grep nagios
ii  nagios-images                        0.4                                        Collection of images and icons for the nagio
ii  nagios-plugins                       1.4.13+git200906171200-1ubuntu3            Plugins for the nagios network monitoring an
ii  nagios-plugins-basic                 1.4.13+git200906171200-1ubuntu3            Plugins for the nagios network monitoring an
ii  nagios-plugins-standard              1.4.13+git200906171200-1ubuntu3            Plugins for the nagios network monitoring an
ii  nagios3                              3.0.6-5ubuntu3                             A host/service/network monitoring and manage
ii  nagios3-common                       3.0.6-5ubuntu3                             support files for nagios3
ii  nagios3-doc                          3.0.6-5ubuntu3                             documentation for nagios3

I'll paste in 1 example email, including all the headers.  If anyone has any idea what these mean, I'd be very grateful for some input.

thanks,
alex

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From: nagios at artichoke.dean
Auto-Submitted: auto-generated
Subject: *** SECURITY information for artichoke ***
Message-Id: <20101129032959.654D6212C9 at artichoke.dean>
Date: Sun, 28 Nov 2010 21:29:59 -0600 (CST)

artichoke : Nov 28 21:29:59 : nagios : ÇìP