We run our most important ones (main api endpoint health check, homepage browser check) anywhere from every minute to every five minutes depending on time of day. We only use one region because our users are mostly in the US. Less vital but still important ones are every fifteen minutes or so.

We overlap “peak” and “non-peak” schedules. The peak one runs during work hours every minute. The “non-peak” ones run 24/7 (no easy way to exclude the time periods that peak runs, otherwise we’d exclude this) but more infrequently, every five minutes.

We use Datadog, but try and be fairly barebones about it because it’s really expensive at scale and we only rarely actually catch issues with them because our CI process has gotten much better. We also used Checkly in the past and had no real complaints, just switched to Datadog to keep everything in one place.