public:

explicit MetricsHandler(Registry& registry);

void RegisterCollectable(const std::weak_ptr<Collectable>& collectable);

bool handleGet(CivetServer* server, struct mg_connection* conn) override;

private:

std::mutex collectables_mutex_;

std::vector<std::weak_ptr<Collectable>> collectables_;

Family<Counter>& bytes_transferred_family_;

Counter& bytes_transferred_;

Family<Counter>& num_scrapes_family_;

Counter& num_scrapes_;

Family<Summary>& request_latencies_family_;

Summary& request_latencies_;