Regarding secondary servers

It would be great if we have a secondary server when the primary server fails down. Lets say If the Server in a region is down for sometime,  Alert Site can automatically pickup a backup server in same location to monitor those URLs. As of now we are getting alerts if the server is down. Alert Site does not have a function to verify from a secondary private location when the other is failing automatically. It would be very helpful when it automatically picks up the secondary one which can make the process continue without any interruption to the current process.