prometheus-cpp/tests/integration/sample_server.cc

#include <chrono>
#include <map>
#include <memory>
#include <string>
#include <thread>

#include <prometheus/exposer.h>
#include <prometheus/registry.h>

int main(int argc, char** argv) {
  using namespace prometheus;

  // create an http server running on port 8080
  Exposer exposer{"127.0.0.1:8080"};

  // 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 dimenstions)
  auto& counter_family = BuildCounter()
                             .Name("time_running_seconds")
                             .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 exposer to scrape the registry on incoming scrapes
  exposer.RegisterCollectable(registry);

  for (;;) {
    std::this_thread::sleep_for(std::chrono::seconds(1));
    // increment the counter by one (second)
    second_counter.Increment();
  }
  return 0;
}