Besides monitoring your site's uptime, Oh Dear offers many other checks to monitor all kinds of aspects of your web app. One of those checks is our DNS check. Whenever we detect problems with your DNS records or when one of the DNS records changes, we can notify you. By default, we only monitor the DNS records of the domain you are monitoring. So when you're monitoring example.com, we'll only monitor the records of that hostname. A CNAME record is a special kind of DNS record.

The most popular check that Oh Dear offers is, without a doubt, our uptime check. It's enabled for almost every site we monitor. By default, this check will notify you when your site returns a non-2xx response, but you can greatly customize that behavior. You can check if the response has certain headers, if the response contains a particular string, and more! Some of our users requested a new behavior: checking the absence of a string on the response.