From 82e41ddc427aa6d41b875642788cb12f765ed40c Mon Sep 17 00:00:00 2001
From: James Tucker <james@tailscale.com>
Date: Thu, 23 Jan 2025 16:31:40 -0800
Subject: [PATCH] cmd/natc: expose netstack metrics in client metrics in natc

Updates tailscale/corp#25169

Signed-off-by: James Tucker <james@tailscale.com>
---
 cmd/natc/natc.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/cmd/natc/natc.go b/cmd/natc/natc.go
index b28f4a1d5..069eabefd 100644
--- a/cmd/natc/natc.go
+++ b/cmd/natc/natc.go
@@ -10,6 +10,7 @@ import (
 	"context"
 	"encoding/binary"
 	"errors"
+	"expvar"
 	"flag"
 	"fmt"
 	"log"
@@ -159,6 +160,9 @@ func main() {
 	if err := ns.SetTransportProtocolOption(tcp.ProtocolNumber, &mslOpt); err != nil {
 		log.Fatalf("could not set TCP MSL: %v", err)
 	}
+	if *debugPort != 0 {
+		expvar.Publish("netstack", ns.ExpVar())
+	}
 
 	lc, err := ts.LocalClient()
 	if err != nil {