[VOL-4442] grpc streaming connection monitoring

Change-Id: Id787e94cf28745d36e72f8ed2f5c316312714db4
diff --git a/protos/voltha_protos/adapter_service.proto b/protos/voltha_protos/adapter_service.proto
index cfd5f29..08578a4 100755
--- a/protos/voltha_protos/adapter_service.proto
+++ b/protos/voltha_protos/adapter_service.proto
@@ -20,7 +20,7 @@
 service AdapterService {
     // GetHealthStatus is used by an AdapterService client to verify connectivity
     // to the gRPC server hosting the AdapterService service
-    rpc GetHealthStatus(common.Connection) returns (health.HealthStatus);
+    rpc GetHealthStatus(stream common.Connection) returns (stream health.HealthStatus);
 
     // Device
     rpc AdoptDevice(device.Device) returns(google.protobuf.Empty);