[ONOS-7683] Initial implementation of openstack telemetry service

Change-Id: I621bed9cff108af194998b7a1e8269a9a6ffd32c
diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/GrpcTelemetryService.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/GrpcTelemetryService.java
index 942e64b..e885b7e 100644
--- a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/GrpcTelemetryService.java
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/GrpcTelemetryService.java
@@ -18,7 +18,7 @@
 /**
  * Service API for publishing openstack telemetry through gRPC producer.
  */
-public interface GrpcTelemetryService {
+public interface GrpcTelemetryService extends TelemetryService {
 
     /**
      * Publishes openstack telemetry to gRPC server.