const (
	SeverityOK      Severity = "ok"
	SeverityWarning Severity = "warning"
	SeverityError   Severity = "error"

	// CodeUnknown is a catch-all health code when something unexpected goes wrong (for example, a panic).
	CodeUnknown Code = "EUNKNOWN"

	CodeProxyUpdate Code = "EWP01"
	CodeProxyFetch  Code = "EWP02"
	// CodeProxyVersionMismatch is no longer used as it's no longer a critical
	// error.
	// CodeProxyVersionMismatch Code = "EWP03"
	CodeProxyUnhealthy Code = "EWP04"

	CodeDatabasePingFailed Code = "EDB01"
	CodeDatabasePingSlow   Code = "EDB02"

	CodeWebsocketDial Code = "EWS01"
	CodeWebsocketEcho Code = "EWS02"
	CodeWebsocketMsg  Code = "EWS03"

	CodeAccessURLNotSet  Code = "EACS01"
	CodeAccessURLInvalid Code = "EACS02"
	CodeAccessURLFetch   Code = "EACS03"
	CodeAccessURLNotOK   Code = "EACS04"

	CodeDERPNodeUsesWebsocket Code = `EDERP01`
	CodeDERPOneNodeUnhealthy  Code = `EDERP02`
	CodeSTUNNoNodes                = `ESTUN01`
	CodeSTUNMapVaryDest            = `ESTUN02`

	CodeProvisionerDaemonsNoProvisionerDaemons     Code = `EPD01`
	CodeProvisionerDaemonVersionMismatch           Code = `EPD02`
	CodeProvisionerDaemonAPIMajorVersionDeprecated Code = `EPD03`

	CodeInterfaceSmallMTU = `EIF01`
)