Metrics now have expiration if not updated

metrics/pve_node_sdn_collector.go

@@ -1,30 +1,35 @@
 package metrics
 
 import (
+	"time"
+
 	"github.com/prometheus/client_golang/prometheus"
-	"github.com/prometheus/client_golang/prometheus/promauto"
 	"lostak.dev/pve-exporter/proxmox"
 )
 
 // PVE SDN state collector.
 type PveSdnCollector struct {
 	apiClient *proxmox.PveApiClient // PVE API client instance.
+	registry  *TTLRegistry          // TTL metrics registry.
 
-	state *prometheus.GaugeVec // SDN state prometheus gauge.
+	state *TTLGaugeVec // SDN state prometheus gauge.
 }
 
 // Create new instance of PVE SDN collector.
-func NewPveSdnCollector(apiClient *proxmox.PveApiClient) *PveSdnCollector {
+func NewPveSdnCollector(apiClient *proxmox.PveApiClient, registry *TTLRegistry) *PveSdnCollector {
 	c := PveSdnCollector{apiClient: apiClient}
+	c.registry = registry
 
 	// SDN Up state.
-	c.state = promauto.NewGaugeVec(
+	c.state = NewTTLGaugeVec(
 		prometheus.GaugeOpts{
 			Name: "pve_sdn_state",
 			Help: "Node software defined network state.",
 		},
 		[]string{"cluster", "node", "sdn", "sdn_id"},
+		1*time.Minute,
 	)
+	c.registry.Register(c.state)
 
 	return &c
 }
@@ -41,8 +46,6 @@ func (c *PveSdnCollector) CollectMetrics() error {
 		return err
 	}
 
-	c.state.Reset()
-
 	for _, node := range cluster.NodeStatuses {
 		sdns := resources.FindNodeSDN(node.Name)
 		if len(*sdns) > 0 {