custom snmp trap

I need to configure a custom snmp trap. for exam. if cpu usage was exceed %60 rate I should get a alert message.as i understand, trap is sent when there is log matching the trap definition. there is no such cpu usage was exceeded XX% log message; anyway, you may write script to inject that message to log, so trap can be sent accordingly.

 

 

not sure if you have seen this article.

 

Custom SNMP Traps by Deb

 

http://devcentral.f5.com/Tutorials/TechTips/tabid/63/articleType/ArticleView/articleId/256/Custom-SNMP-Traps.aspx

 

 

I would like to know that can I get a similar clear message " CPU tempature is too high" or are there clear message for all OIDs. i do not think there is clear trap for all oids. there is some but you know not all.