UPTIME MONITORING
Uptime monitor is a monitor that runs from one of Monitor.Us locations and periodically checks your web site (HTTP, HTTPS, etc.) or web service (POP3, FTP, etc.) availability. Uptime Monitoring can alert you about failures within 30 minutes of a problem by a method you choose, e.g. email, SMS, phone call, IM, Twitter, and URL (see Alerts and Contacts).