We use IPMonitor to check uptime, and it has many options for checking the site, checking the keyword, checking the HTTP response, and response time. You can also use SNMP to determine the responsiveness of the processor and RAM and the rest of the size of the hard drives, among many other options. It supports multiple servers and server types, not just a website or database.
In addition, we check the basic speed and response speed using AlertSite.
A third party, Keynote, is testing our sites to verify that they are navigable the way people would browse. They have scripts to simulate clicks and interactions.
We use Spotlight to manage the SQL server, as well as a good old perfmon to detail the problem.
Jordan
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