[VOL-5506] Enable grpc stats

Change-Id: I9a417066c4c3f1b4974863c96ae6fa713ae932ee
Signed-off-by: Abhay Kumar <abhay.kumar@radisys.com>
diff --git a/internal/pkg/config/config.go b/internal/pkg/config/config.go
index e951584..704aa77 100644
--- a/internal/pkg/config/config.go
+++ b/internal/pkg/config/config.go
@@ -41,6 +41,7 @@
 	EventTopic                  string
 	LogLevel                    string
 	ProbeHost                   string
+	PrometheusAddress           string
 	TraceAgentAddress           string
 	OnuVendorIds                string
 	AdapterEndpoint             string
@@ -148,6 +149,11 @@
 		8080,
 		"The port on which to listen to answer liveness and readiness probe queries over HTTP")
 
+	fs.StringVar(&(so.PrometheusAddress),
+		"prometheus_port",
+		":8081",
+		"Used for exposing the metrics to prometheus.")
+
 	fs.DurationVar(&(so.LiveProbeInterval),
 		"live_probe_interval",
 		60*time.Second,