If you use website monitoring services for multiple websites, they annoy you with alert mails even when your good for nothing site goes down. Here is how you can setup alerts only for high priority sites and ignore downtimes of other sites.
Are you aware of the time by which your site goes down? Every server has downtimes and webmaster should monitor websites for performance and uptime to keep the website go smooth. Here are the free website monitoring services to help you to keep an eye on server.