"The time remaining, in seconds, before the root certificate will expire. "+
			"A negative value indicates the cert is expired.",
	)
	certChainExpiryTimestamp = monitoring.NewGauge(
		"citadel_server_cert_chain_expiry_timestamp",
		"The unix timestamp, in seconds, when Citadel cert chain will expire. "+
			"A negative time indicates the cert is expired.",
	)
	certChainExpirySeconds = monitoring.NewDerivedGauge(