Create a startup time metric

Author: michaelasp

pkg/driver/driver.go

@@ -192,6 +192,10 @@ func Start(ctx context.Context, driverName string, kubeClient kubernetes.Interfa
 		plugin.netdb = inventory.New()
 	}
 	go func() {
+		begin := time.Now()
+		defer func() {
+			inventoryStartupDurationSeconds.Set(time.Since(begin).Seconds())
+		}()
 		for i := 0; i < maxAttempts; i++ {
 			err = plugin.netdb.Run(ctx)
 			if err != nil {

pkg/driver/metrics.go

@@ -47,6 +47,7 @@ func registerMetrics() {
 		prometheus.MustRegister(nriPluginRequestsLatencySeconds)
 		prometheus.MustRegister(publishedDevicesTotal)
 		prometheus.MustRegister(lastPublishedTime)
+		prometheus.MustRegister(inventoryStartupDurationSeconds)
 	})
 }
 
@@ -87,4 +88,10 @@ var (
 		Name:      "last_published_time_seconds",
 		Help:      "The timestamp of the last successful resource publication.",
 	})
+	inventoryStartupDurationSeconds = prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: "dranet",
+		Subsystem: "driver",
+		Name:      "inventory_startup_duration_seconds",
+		Help:      "The duration of the inventory startup.",
+	})
 )