Checkers

Checkers are the building blocks of happyDomain’s monitoring system. Each one collects data about a domain, a zone or a service, evaluates it against a set of rules, and reports a clear status (OK, Warning, Critical or Error).

This chapter documents every checker shipped with happyDomain: what it verifies, the scope it applies to, the options you can tune, and the rules it evaluates. For the day-to-day workflow of configuring, scheduling and reading checks in the interface, see /en/pages/checks/.

Scopes

Every checker declares the scope it operates on:

  • Domain-level — concerns the domain itself, independent of its DNS records (registration status, expiry, transfer lock…).
  • Zone-level — needs the full zone content (DNSSEC validation, delegation consistency…).
  • Service-level — targets a specific service published on a subdomain (HTTP, TLS, ping…), and is configured from that service’s own Checks tab.

Statuses

Checkers report one of the following statuses, in order of severity:

Status Meaning
OK Everything is within acceptable parameters
Info Informational finding, no action needed
Warning A threshold is approaching; attention recommended
Critical A threshold has been exceeded; action required
Error The check itself failed (collection error, bad configuration)
Unknown The check could not determine a result