feature: GaugeHelper supports labels

Signed-off-by: Dmitriy Khaustov aka xDimon <[email protected]>

Author: xDimon

src/app/impl/application_impl.cpp

@@ -34,15 +34,13 @@ namespace jam::app {
         system_clock_(std::move(system_clock)),
         metrics_registry_(metrics::createRegistry()) {
     // Metric for exposing name and version of node
-    constexpr auto buildInfoMetricName = "jam_build_info";
-    metrics_registry_->registerGaugeFamily(
-        buildInfoMetricName,
-        "A metric with a constant '1' value labeled by name, version");
-    auto metric_build_info = metrics_registry_->registerGaugeMetric(
-        buildInfoMetricName,
-        {{"name", app_config_->nodeName()},
-         {"version", app_config_->nodeVersion()}});
-    metric_build_info->set(1);
+    metrics::GaugeHelper(
+        "jam_build_info",
+        "A metric with a constant '1' value labeled by name, version",
+        std::map<std::string, std::string>{
+            {"name", app_config_->nodeName()},
+            {"version", app_config_->nodeVersion()}})
+        ->set(1);
   }
 
   void ApplicationImpl::run() {

src/metrics/histogram_timer.hpp

@@ -27,6 +27,12 @@ namespace jam::metrics {
       registry_->registerGaugeFamily(name, help);
       metric_ = registry_->registerGaugeMetric(name);
     }
+    GaugeHelper(const std::string &name,
+                const std::string &help,
+                const std::map<std::string, std::string> &labels) {
+      registry_->registerGaugeFamily(name, help);
+      metric_ = registry_->registerGaugeMetric(name, labels);
+    }
 
     auto *operator->() const {
       return metric_;