The dread of every webmaster. Of every e-commerce site. Of every blogger.
For those whom have advertising or offer services on their pages, a site that is down = a site not making money. The first step to solving a down site is knowing that it is down. But nobody wants to visit their site every few minutes, so, uptime checkers here we come!
Some sites are setup to monitor ports on your sever (e.g. port 80 for web service), and if the port is closed, they can perform an action. For instance, in geek code, if(sitedown) { sms(kelvin) }. Or, you can use the free services that have less features (for instance, less frequent checks or fewer ports.
All of this would be quite trivial to implement, but it already exists, so why not take advantage of it?
I use, and recommend, Hyperspin. But have heard nice things about Siteuptime.
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