Question 1

What counts as "down"?

Accepted Answer

An uptime check fails when the target returns a timeout, a connection error, or a response outside the expected range — by default, anything that isn't a 2xx or 3xx HTTP status. We confirm before we page you A single failed check is rarely a real outage — networks blip, and a momentary timeout from…

Question 2

Uptime checks: regions, intervals and degraded thresholds

Accepted Answer

Three settings shape an uptime monitor: where it checks from, how often, and what "too slow" means. Regions CertSentry runs uptime checks from up to three regions across different continents. More regions buys you two things: a stricter quorum (a problem is only "real" when several vantage points ag…

Question 3

How do heartbeat monitors work?

Accepted Answer

Most checks reach out to your target. A heartbeat works the other way: your job pings us, and we alert when the pings stop. It's the dead-man's-switch for work that has no public URL — backups, cron jobs, queue workers, nightly ETL, certificate renewals themselves. Set one up Create a heartbeat moni…

Uptime & availability

Uptime & availability