A virtual target file to be read by monitoring services instead of using a static HTML page.
Depending on your configuration you may need to visit the Permalink settings page and simply click save. This will refresh the permalink settings and the page will be found. You may have to repeat this process if you disable or delete this plugin.
There are two virtual target files supplied that will appear as if they are in the root of your website (although there is no physical file there)
This plugin does not perform monitoring of your site - you need a monitoring service for this. You configure the external monitoring service to point to one of the two virtual files that this plugin creates.