Our website is hosted by a vendor and we recently had an outage where the site was "down" for roughly ten hours due to none of the alarms having activated. The outage was with a backend process, so the site was returning a cryptic DB error to users. Since the site was responding with something other than a standard error code, none of the alarms went off.
I am looking for a monitoring service that would check the website periodically and emulate a few user actions - such as accessing a couple of pages and making certain a specific result comes back (i.e. not just pages of SQL errors). The goal is to detect a situation where the web server is operational but the content is not being delivered as expected.
Any ideas or suggestions? I prefer a hosted service, however if there is a tool I can run on one of my windows servers I am open to that as well. The key is that we do not host the site, so I don't have server level access to the site.