Set gauge to 1 when collector is successful

Signed-off-by: Julien Pivotto <[email protected]>
Signed-off-by: Khiem Doan <[email protected]>

Author: Julien Pivotto

cmd/postgres_exporter/probe.go

@@ -114,6 +114,7 @@ func handleProbe(logger log.Logger) http.HandlerFunc {
 
 		duration := time.Since(start).Seconds()
 		probeDurationGauge.Set(duration)
+		probeSuccessGauge.Set(1)
 
 		// TODO check success, etc
 		h := promhttp.HandlerFor(registry, promhttp.HandlerOpts{})