Add Jibri detector metrics

main.go

@@ -45,6 +45,12 @@ jitsi_conferences {{.Conferences}}
 # HELP jitsi_participants Current number of active participants
 # TYPE jitsi_participants gauge
 jitsi_participants {{.Participants}}
+# HELP jibri_detector_count Total number of detected Jibri instances
+# TYPE jibri_detector_count gauge
+jibri_detector_count {{.JibriDetector.Count}}
+# HELP jibri_detector_available Number of available Jibri instances
+# TYPE jibri_detector_available gauge
+jibri_detector_available {{.JibriDetector.Available}}
 `))
 
 func serveMetrics(w http.ResponseWriter, req *http.Request) {