From ff38670c315a701365f5c9aad1554fcb7e2d7c9f Mon Sep 17 00:00:00 2001
From: Conrad Hoffmann <ch@bitfehler.net>
Date: Wed, 6 May 2026 10:58:19 +0200
Subject: [PATCH] server: add health endpoint to metrics listener

There are already facilities to run the metrics listener on a fixed
port, so this makes for a useful endpoint to have metrics and a health
check in Kubernetes without exposing them to the world. In the long run,
I would like to remove the metrics endpoint from the public listener,
but that will take more work.
---
 server/server.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/server/server.go b/server/server.go
index 4bbf350ef80e2e9e949fcd1541ca2e559dc4001c..326a13f8e72efc96948a1a95b1b6eb542871f401 100644
--- a/server/server.go
+++ b/server/server.go
@@ -438,6 +438,9 @@ func (server *Server) Run() {
 
 	mux := &http.ServeMux{}
 	mux.Handle("/metrics", promhttp.Handler())
+	mux.HandleFunc("/healthz", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("OK"))
+	})
 	pserver := &http.Server{Handler: mux}
 	plisten, err := net.Listen("tcp", server.metricsAddr)
 	if err != nil {