Most WebObjects applications automatically include a WOStats page and record statistics about themselves in that page while they run. To look at these statistics, access the WOStats page while the application is running. You can do this through Monitor or through any browser that can access your application.
http://myhost/cgi-bin/WebObjects/MyWebApp.woa/wa/WOStats
If there are multiple instances, specify the instance number as well:
http://myhost/cgi-bin/WebObjects/MyWebApp.woa/1/wa/WOStats
The "1" just before "/wa" is the instance number.
See the description of WOStats in the WOExtensions Reference for more information about what the page displays.