feat: Allow renaming domains

main.go

@@ -28,7 +28,7 @@ type CertificateMetrics struct {
 	IsValid  prometheus.Gauge
 }
 
-func NewCertificateMetrics(domain string, port int, alpn []string) CertificateMetrics {
+func NewCertificateMetrics(domain string, port int, alpn []string, name string) CertificateMetrics {
 	metrics := CertificateMetrics{
 		Domain: domain,
 		Port:   port,
@@ -36,13 +36,13 @@ func NewCertificateMetrics(domain string, port int, alpn []string) CertificateMe
 		ExpiryIn: prometheus.NewGauge(
 			prometheus.GaugeOpts{
 				Name:        "cert_status_expiry_in",
-				ConstLabels: prometheus.Labels{"domain": domain},
+				ConstLabels: prometheus.Labels{"name": name},
 			},
 		),
 		IsValid: prometheus.NewGauge(
 			prometheus.GaugeOpts{
 				Name:        "cert_status_is_valid",
-				ConstLabels: prometheus.Labels{"domain": domain},
+				ConstLabels: prometheus.Labels{"name": name},
 			},
 		),
 	}
@@ -112,11 +112,18 @@ func run(ctx *cli.Context) error {
 	for _, d := range domains {
 		log.Debugf("Parsing '%s'...", d)
 		parts := strings.Split(d, ":")
-		if len(parts) != 3 {
+		if len(parts) < 3 {
 			log.Errorf("Invalid domain format for '%s'", d)
 			return errors.New("Invalid domain format: Expects <domain>:<port>:<alpn>")
 		}
 
+		name := ""
+		if len(parts) == 4 {
+			name = parts[3]
+		} else {
+			name = parts[0]
+		}
+
 		port, err := strconv.Atoi(parts[1])
 		if err != nil {
 			log.Errorf("Failed to parse port of '%s'", d)
@@ -126,11 +133,12 @@ func run(ctx *cli.Context) error {
 		// Create the metric, and register it
 		// TODO: Make this prettier
 		alpn := strings.Split(parts[2], ";")
-		log.Debugf("Using ALPNs: %v", alpn)
+		log.Debugf("Registering: domain='%s' port='%d' alpn=%v name='%s'", parts[0], port, alpn, name)
 		metric := NewCertificateMetrics(
 			parts[0],
 			port,
 			alpn,
+			name,
 		)
 		metric.register(registry)
 		metrics = append(metrics, metric)