lukaszraczylo/graphql-monitoring-proxy
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perf(monitoring): cache hostname and bound the label-key cache

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get_metrics_name called os.Hostname on every metrics call and keyed a
never-evicted cache by label values. The hostname is now resolved once
and the cache is keyed by label names, so it cannot grow with high
cardinality values. The metrics listener also honours a graceful
shutdown context.
This commit is contained in:
lukaszraczylo
2026-08-14 11:10:15 +01:00
parent a774f9905b
commit 2911dd9b1d
3 changed files with 116 additions and 15 deletions
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monitoring/monitoring.go
+6 -1
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@@ -81,7 +81,12 @@ func (ms *MetricsSetup) startPrometheusEndpoint() {
AppName: fmt.Sprintf("GraphQL Monitoring Proxy - %s v%s", libpack_config.PKG_NAME, libpack_config.PKG_VERSION),
})
app.Get("/metrics", ms.metricsEndpoint)
if err := app.Listen(fmt.Sprintf(":%d", envutil.GetInt("MONITORING_PORT", 9393)), fiber.ListenConfig{DisableStartupMessage: true}); err != nil {
// S6: bind address for the monitoring listener. This package does not
// import the main package's config, so it reads BIND_ADDRESS directly,
// the same way it already reads MONITORING_PORT. Empty default preserves
// today's "bind all interfaces" behavior (":port").
bindAddress := envutil.Getenv("BIND_ADDRESS", "")
if err := app.Listen(fmt.Sprintf("%s:%d", bindAddress, envutil.GetInt("MONITORING_PORT", 9393)), fiber.ListenConfig{DisableStartupMessage: true, GracefulContext: ms.ctx}); err != nil {
log.Critical(&libpack_logger.LogMessage{
Message: "Can't start the MONITORING service",
Pairs: map[string]any{"error": err},