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You can have IWSVA track a number of system parameters, including CPU utilization of the HTTP and/or FTP service, HTTP and FTP service responses, and current active threads.
From the main IWSVA menu, click Logs > Log Settings.
In the Reporting Logs tab, look under Options and enable the following: Gather performance data Log HTTP/HTTPS/FTP access events
Specify how often you want IWSVA to poll the server. The default is every three minutes.
Click Save.