snapshot of https://github.com/ory/keto.git (master, 2026-09-16; blobs > 131072B omitted)

oryx/prometheusx/handler.go

@@ -0,0 +1,37 @@
+// Copyright © 2023 Ory Corp
+// SPDX-License-Identifier: Apache-2.0
+
+package prometheusx
+
+import (
+	"net/http"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+const (
+	MetricsPrometheusPath = "/metrics/prometheus"
+)
+
+type muxrouter interface {
+	Handle(path string, handle http.Handler)
+}
+
+// Handler returns the metrics handler. It mirrors promhttp.Handler() but
+// additionally serves the OpenMetrics format when the scraper negotiates it,
+// because that is the only exposition format that carries exemplars (trace
+// links on counters and histograms). It is safe to call multiple times.
+func Handler() http.Handler {
+	return promhttp.InstrumentMetricHandler(
+		prometheus.DefaultRegisterer,
+		promhttp.HandlerFor(prometheus.DefaultGatherer, promhttp.HandlerOpts{
+			EnableOpenMetrics: true,
+		}),
+	)
+}
+
+// SetMuxRoutes registers the prometheus handler.
+func SetMuxRoutes(mux muxrouter) {
+	mux.Handle("GET "+MetricsPrometheusPath, Handler())
+}