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65 lines
2.5 KiB
65 lines
2.5 KiB
#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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// for clarity, we deduce the required types |
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using IntegerCounter = Counter<uint64_t>; |
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using FloatingCounter = Counter<double>; |
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using IntegerCounterFamily = CustomFamily<IntegerCounter>; |
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using FloatingCounterFamily = CustomFamily<FloatingCounter>; |
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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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Registry 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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FloatingCounterFamily& packet_counter{ FloatingCounter::Family::Build(registry, "observed_packets_total", "Number of observed packets") }; |
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// add and remember dimensional data, incrementing those is very cheap |
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FloatingCounter& tcp_rx_counter{ packet_counter.Add({ {"protocol", "tcp"}, {"direction", "rx"} }) }; |
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FloatingCounter& tcp_tx_counter{ packet_counter.Add({ {"protocol", "tcp"}, {"direction", "tx"} }) }; |
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FloatingCounter& udp_rx_counter{ packet_counter.Add({ {"protocol", "udp"}, {"direction", "rx"} }) }; |
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FloatingCounter& 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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IntegerCounterFamily& http_requests_counter = IntegerCounter::Family::Build(registry, "http_requests_total", "Number of HTTP requests"); |
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for (;; ) { |
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std::this_thread::sleep_for(std::chrono::seconds(1)); |
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const int random_value = std::rand(); |
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if (random_value & 1) tcp_rx_counter++; |
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if (random_value & 2) ++tcp_tx_counter; |
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if (random_value & 4) udp_rx_counter += 0.5; |
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if (random_value & 8) udp_tx_counter += 0.7; |
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const std::array<std::string, 4> methods = { "GET", "PUT", "POST", "HEAD" }; |
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const std::string& 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} }) += 10; |
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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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