You can configure the security appliance to send some or all system log messages to an e-mail address. When sent by e-mail, a system log message appears in the subject line of the e-mail message. For this reason, we recommend configuring this option to notify administrators of system log messages with high severity levels, such as critical, alert, and emergency.
For the VPN Load Balancing its Associated Message ID Numbers is 718
For the further description for message logging following URL will help you
http://www.cisco.com/en/US/docs/security/asa/asa72/system/message/logconf.html
