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Improve usability of Prometheus metrics backend (#16060)

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sfan5 2025-04-23 09:30:04 +02:00 • committed by GitHub
parent 00addc3e5d
commit 7c619bdc9a
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3 changed files with 20 additions and 9 deletions
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7
builtin/settingtypes.txt
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@ -2241,9 +2241,10 @@ lighting_boost_spread (Light curve boost spread) float 0.2 0.0 0.4
enable_ipv6 (IPv6) [common] bool true
# Prometheus listener address.
# If Luanti is compiled with ENABLE_PROMETHEUS option enabled,
# enable metrics listener for Prometheus on that address.
# Metrics can be fetched on http://127.0.0.1:30000/metrics
# If Luanti is compiled with Prometheus support, this setting
# enables the metrics listener for Prometheus on that address.
# By default you can fetch metrics from http://127.0.0.1:30000/metrics.
# An empty value disables the metrics listener.
prometheus_listener_address (Prometheus listener address) [server] string 127.0.0.1:30000
# Maximum size of the client's outgoing chat queue.

10
src/server.cpp
View file

@ -284,12 +284,12 @@ Server::Server(
throw ServerError("Supplied invalid gamespec");
#if USE_PROMETHEUS
if (!simple_singleplayer_mode)
m_metrics_backend = std::unique_ptr<MetricsBackend>(createPrometheusMetricsBackend());
else
#else
if (true)
if (!simple_singleplayer_mode) {
// Note: may return null
m_metrics_backend.reset(createPrometheusMetricsBackend());
}
#endif
if (!m_metrics_backend)
m_metrics_backend = std::make_unique<MetricsBackend>();
m_uptime_counter = m_metrics_backend->addCounter("minetest_core_server_uptime", "Server uptime (in seconds)");

12
src/util/metricsbackend.cpp
View file

@ -11,6 +11,7 @@
#include <prometheus/gauge.h>
#include "log.h"
#include "settings.h"
#include "exceptions.h"
#endif
/* Plain implementation */
@ -183,7 +184,16 @@ MetricsBackend *createPrometheusMetricsBackend()
{
std::string addr;
g_settings->getNoEx("prometheus_listener_address", addr);
return new PrometheusMetricsBackend(addr);
if (addr.empty())
return nullptr;
infostream << "Starting Prometheus metrics on " << addr << std::endl;
try {
return new PrometheusMetricsBackend(addr);
} catch (std::exception &e) {
errorstream << "Error while starting Prometheus metrics on " << addr
<< ":\n" << e.what() << std::endl;
throw e;
}
}
#endif