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67 lines
2.6 KiB
67 lines
2.6 KiB
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#include <prometheus/registry.h> |
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#include <prometheus/counter.h> |
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#include <prometheus/text_serializer.h> |
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#include <array> |
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#include <chrono> |
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#include <cstdlib> |
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#include <memory> |
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#include <string> |
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#include <thread> |
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#include <iostream> |
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int main() { |
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using namespace prometheus; |
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// create a metrics registry |
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// @note it's the users responsibility to keep the object alive |
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auto registry = std::make_shared<Registry>(); |
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// add a new counter family to the registry (families combine values with the |
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// same name, but distinct label dimensions) |
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// |
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// @note please follow the metric-naming best-practices: |
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// https://prometheus.io/docs/practices/naming/ |
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auto& packet_counter = BuildCounter() |
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.Name("observed_packets_total") |
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.Help("Number of observed packets") |
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.Register(*registry); |
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// add and remember dimensional data, incrementing those is very cheap |
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auto& tcp_rx_counter = packet_counter.Add({ {"protocol", "tcp"}, {"direction", "rx"} }); |
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auto& tcp_tx_counter = packet_counter.Add({ {"protocol", "tcp"}, {"direction", "tx"} }); |
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auto& udp_rx_counter = packet_counter.Add({ {"protocol", "udp"}, {"direction", "rx"} }); |
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auto& udp_tx_counter = packet_counter.Add({ {"protocol", "udp"}, {"direction", "tx"} }); |
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// add a counter whose dimensional data is not known at compile time |
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// nevertheless dimensional values should only occur in low cardinality: |
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// https://prometheus.io/docs/practices/naming/#labels |
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auto& http_requests_counter = BuildCounter() |
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.Name("http_requests_total") |
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.Help("Number of HTTP requests") |
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.Register(*registry); |
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// ask the exposer to scrape the registry on incoming HTTP requests |
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//exposer.RegisterCollectable(registry); |
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for ( ;; ) { |
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std::this_thread::sleep_for(std::chrono::seconds(1)); |
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const auto random_value = std::rand(); |
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if (random_value & 1) tcp_rx_counter.Increment(); |
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if (random_value & 2) tcp_tx_counter.Increment(); |
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if (random_value & 4) udp_rx_counter.Increment(10); |
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if (random_value & 8) udp_tx_counter.Increment(10); |
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const std::array<std::string, 4> methods = { "GET", "PUT", "POST", "HEAD" }; |
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auto method = methods.at(static_cast<std::size_t>(random_value) % methods.size()); |
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// dynamically calling Family<T>.Add() works but is slow and should be avoided |
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http_requests_counter.Add({ {"method", method} }).Increment(); |
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TextSerializer text_serializer; |
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text_serializer.Serialize(std::cout, registry->Collect()); |
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} |
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}
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