Create a startup time metric

Author: michaelasp

pkg/driver/driver.go

@@ -106,6 +106,10 @@ type Option func(*NetworkDriver)
 
 func Start(ctx context.Context, driverName string, kubeClient kubernetes.Interface, nodeName string, opts ...Option) (*NetworkDriver, error) {
 	registerMetrics()
+	begin := time.Now()
+	defer func() {
+		startupTime.Set(time.Since(begin).Seconds())
+	}()
 
 	rdmaNetnsMode, err := nlwrap.RdmaSystemGetNetnsMode()
 	if err != nil {

pkg/driver/metrics.go

@@ -87,4 +87,10 @@ var (
 		Name:      "last_published_time_seconds",
 		Help:      "The timestamp of the last successful resource publication.",
 	})
+	startupTime = prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: "dranet",
+		Subsystem: "driver",
+		Name:      "startup_time_seconds",
+		Help:      "The timestamp of the driver startup.",
+	})
 )