Monitoring

Every kind of check Undownable runs, explained: what it watches, how it alerts, and how to set it up.

• Cron job monitoring

  A dead man's switch for cron jobs, backups, and scheduled tasks. Ping a private URL when the job succeeds, get alerted the moment the pings stop.

• DNS monitoring

  Resolve A, AAAA, CNAME, MX, TXT, or NS records and assert the answer you expect. Catch hijacks, expired domains, and botched migrations early.

• JSON API monitoring

  Assert a value at a dot-notation path in the JSON response, with any HTTP method and request body. Catch an API returning 200 with a failing payload.

• Keyword monitoring

  A 200 response does not prove your page works. Assert that real content is present, or that an error string is absent, on every single check.

• Ping monitoring

  ICMP reachability with real round-trip times parsed from the reply, not wall-clock guesses. Charted latency, confirmed outages, alerts on six channels.

• SSL certificate monitoring

  Verify the full chain, hostname, and SAN list, not just an expiry date. Escalating warnings at 30, 14, 7, and 1 days, plus an all-clear on renewal.

• TCP port monitoring

  Prove something is actually listening: databases, mail servers, SSH, game servers, anything speaking TCP. IPv4 and IPv6, with connect times recorded.

• Website monitoring

  Watch sites, APIs, ports, DNS, and certificates from outside your network. Confirmed outages, self-managing incidents, and alerts on six channels.