diff --git a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/TelemetryAdminService.java b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/TelemetryAdminService.java
index 63e0c3f..98b580d 100644
--- a/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/TelemetryAdminService.java
+++ b/apps/openstacktelemetry/api/src/main/java/org/onosproject/openstacktelemetry/api/TelemetryAdminService.java
@@ -24,8 +24,9 @@
      * Prepares and launches the telemetry producer.
      *
      * @param name telemetry service name
+     * @return true if the service is successfully started, false otherwise
      */
-    void start(String name);
+    boolean start(String name);
 
     /**
      * Terminates the telemetry producer.
@@ -38,8 +39,9 @@
      * Restarts the telemetry producer.
      *
      * @param name telemetry service name
+     * @return true if the service is successfully restarted, false otherwise
      */
-    void restart(String name);
+    boolean restart(String name);
 
     /**
      * Launches all telemetry services.