Knowledge base

Check types

HTTP, TCP, DNS, SSL, domain, ping, and heartbeat checks.

  • HTTP checks Monitor a URL's status code, response body, and TLS certificate, with custom headers and basic auth.
  • TCP checks Confirm a host and port accept connections, optionally sending a probe string and matching the reply.
  • DNS checks Resolve A, AAAA, CNAME, MX, TXT, or NS records against a chosen resolver and optionally match expected values.
  • SSL certificate checks A failed or expired certificate counts as downtime; advance expiry warnings (30/14/7/1 days out) are separate and don't.
  • Domain expiry checks A domain check watches registration expiry, not your certificate. A failed lookup counts as downtime; advance warnings don't.
  • Ping checks ICMP echo checks with a configurable packet-loss threshold.
  • Heartbeat checks A dead-man's-switch URL your job calls in — miss the grace period and Status raises it.
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