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. We're happy to share that we've now adde...
