First Commit

ext/prometheus-cpp-lite-1.0/examples/gateway_example.cpp

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+#include <chrono>
+#include <iostream>
+#include <memory>
+#include <string>
+#include <thread>
+
+#include "prometheus/client_metric.h"
+#include "prometheus/counter.h"
+#include "prometheus/family.h"
+#include "prometheus/gateway.h"
+#include "prometheus/registry.h"
+
+#ifdef _WIN32
+#include <Winsock2.h>
+#else
+#include <unistd.h>
+#endif
+
+static std::string GetHostName() {
+  char hostname[1024];
+
+  if (::gethostname(hostname, sizeof(hostname))) {
+    return {};
+  }
+  return hostname;
+}
+
+int main() {
+  using namespace prometheus;
+
+  // create a push gateway
+  const auto labels = Gateway::GetInstanceLabel(GetHostName());
+
+  Gateway gateway{"127.0.0.1", "9091", "sample_client", labels};
+
+  // create a metrics registry with component=main labels applied to all its
+  // metrics
+  auto registry = std::make_shared<Registry>();
+
+  // add a new counter family to the registry (families combine values with the
+  // same name, but distinct label dimensions)
+  auto& counter_family = BuildCounter()
+                             .Name("time_running_seconds_total")
+                             .Help("How many seconds is this server running?")
+                             .Labels({{"label", "value"}})
+                             .Register(*registry);
+
+  // add a counter to the metric family
+  auto& second_counter = counter_family.Add(
+      {{"another_label", "value"}, {"yet_another_label", "value"}});
+
+  // ask the pusher to push the metrics to the pushgateway
+  gateway.RegisterCollectable(registry);
+
+  for (;;) {
+    std::this_thread::sleep_for(std::chrono::seconds(1));
+    // increment the counter by one (second)
+    second_counter.Increment();
+
+    // push metrics
+    auto returnCode = gateway.Push();
+    std::cout << "returnCode is " << returnCode << std::endl;
+  }
+}