From ddcda9f7a280d567ecae39c3f9a66a4116064017 Mon Sep 17 00:00:00 2001
From: Roberto D'Auria <roberto@measurementlab.net>
Date: Thu, 23 Jul 2026 13:47:59 +0200
Subject: [PATCH] fix(register): exit when the /ready healthcheck server fails

---
 cmd/register/main.go | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/cmd/register/main.go b/cmd/register/main.go
index 859a5df..3395656 100644
--- a/cmd/register/main.go
+++ b/cmd/register/main.go
@@ -100,10 +100,14 @@ func main() {
 
 	siteProb.Value = fmt.Sprintf("%f", probability)
 
-	// Set up health server.
+	// Set up health server. If it dies, exit so the supervisor restarts us:
+	// a silently dead /ready endpoint makes readiness checks fail forever
+	// while the process still looks healthy.
 	mux := http.NewServeMux()
 	mux.HandleFunc("/ready", Ready)
-	go http.ListenAndServe(*hcAddr, mux)
+	go func() {
+		rtx.Must(http.ListenAndServe(*hcAddr, mux), "Failed to serve /ready endpoint")
+	}()
 
 	// Register for the first time.
 	register()