An implementation of the Open Group's Application Response Measurement (ARM) Version 4 standard. The ARM standard describes a means of breaking an application down into it's constituent transactions, and measuring response time across multiple tiers.
simpleWSMonitor will keep track of some values that nearly determine the availability of your webservers. It may help you find some bottlenecks from the server to your visitor and it's very lightweight, it doesn't even need a cron to work.