I would do this with either url_response probe on it's own, or combining url_response probe with the logmon probe.
You can get the page with url_response and then check for a specific substring in the returned response such as "status=ok" or whatever is returned when there is no fault and then alert when that string doesn't exist.
If you wanted to go into further detail, you can combine it with the logmon probe and do more in-depth parsing of the returned response and generate the alerts that way.
Never used the cuegtw and it doesn't look like it has been updated in about 9 years.