Remove unused MakeInstanceTuplesMetricName()
diff --git a/heron/stmgr/src/cpp/manager/stmgr-server.h b/heron/stmgr/src/cpp/manager/stmgr-server.h
index a96f019..190422f 100644
--- a/heron/stmgr/src/cpp/manager/stmgr-server.h
+++ b/heron/stmgr/src/cpp/manager/stmgr-server.h
@@ -77,7 +77,6 @@
  private:
   sp_string MakeBackPressureCompIdMetricName(const sp_string& instanceid);
   sp_string MakeQueueSizeCompIdMetricName(const sp_string& instanceid);
-  sp_string MakeInstanceTuplesMetricName(const sp_string& instanceid);
   sp_string GetInstanceName(Connection* _connection);
   void UpdateQueueMetrics(EventLoop::Status);