feat: Add golang metrics to argo-events metrics registry. (#2557)

Signed-off-by: Antonio Si <[email protected]>
Co-authored-by: Antonio Si <[email protected]>

metrics/metrics.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"net/http"
 
+	"github.com/prometheus/client_golang/prometheus/collectors"
+
 	"github.com/prometheus/client_golang/prometheus"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 	"go.uber.org/zap"
@@ -167,8 +169,9 @@ func (m *Metrics) ActionDuration(sensorName, triggerName string, num float64) {
 func (m *Metrics) Run(ctx context.Context, addr string) {
 	log := logging.FromContext(ctx)
 	metricsRegistry := prometheus.NewRegistry()
-	metricsRegistry.MustRegister(m)
+	metricsRegistry.MustRegister(collectors.NewGoCollector(), m)
 	http.Handle("/metrics", promhttp.HandlerFor(metricsRegistry, promhttp.HandlerOpts{}))
+
 	log.Info("starting metrics server")
 	if err := http.ListenAndServe(addr, nil); err != nil {
 		log.Fatalw("failed to start metrics server", zap.Error(err))