line cov

Former-commit-id: 5a32ee75fb9d0974b3a6f464cdcf6634a444c049

cpp/src/metrics/PrometheusMetrics.h

@@ -46,7 +46,7 @@ class PrometheusMetrics: public MetricsBase {
     std::shared_ptr<prometheus::Registry> registry_ = std::make_shared<prometheus::Registry>();
     bool startup_ = false;
  public:
-
+    void SetStartup(bool startup) {startup_ = startup;};
     void AddVectorsSuccessTotalIncrement(double value = 1.0) override { if(startup_) add_vectors_success_total_.Increment(value);};
     void AddVectorsFailTotalIncrement(double value = 1.0) override { if(startup_) add_vectors_fail_total_.Increment(value);};
     void AddVectorsDurationHistogramOberve(double value) override { if(startup_) add_vectors_duration_histogram_.Observe(value);};

cpp/unittest/metrics/prometheus_test.cpp

@@ -14,6 +14,7 @@ using namespace zilliz::milvus;
 TEST(PrometheusTest, Prometheus_Test){
     server::PrometheusMetrics instance = server::PrometheusMetrics::GetInstance();
     instance.Init();
+    instance.SetStartup(true);
     server::SystemInfo::GetInstance().Init();
     instance.AddVectorsSuccessTotalIncrement();
     instance.AddVectorsFailTotalIncrement();