Adding OpenTelemetry Metrics and Tracing

wgnetstack/wgnetstack.go

@@ -1,6 +1,7 @@
 package wgnetstack
 
 import (
+	"context"
 	"crypto/rand"
 	"encoding/base64"
 	"encoding/hex"
@@ -26,6 +27,8 @@ import (
 	"golang.zx2c4.com/wireguard/tun"
 	"golang.zx2c4.com/wireguard/tun/netstack"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
+
+	"github.com/fosrl/newt/internal/telemetry"
 )
 
 type WgConfig struct {
@@ -242,14 +245,20 @@ func NewWireGuardService(interfaceName string, mtu int, generateAndSaveKeyTo str
 	return service, nil
 }
 
+// ReportRTT allows reporting native RTTs to telemetry, rate-limited externally.
+func (s *WireGuardService) ReportRTT(seconds float64) {
+	if s.serverPubKey == "" { return }
+	telemetry.ObserveTunnelLatency(context.Background(), s.serverPubKey, "wireguard", seconds)
+}
+
 func (s *WireGuardService) addTcpTarget(msg websocket.WSMessage) {
 	logger.Debug("Received: %+v", msg)
 
 	// if there is no wgData or pm, we can't add targets
 	if s.TunnelIP == "" || s.proxyManager == nil {
 		logger.Info("No tunnel IP or proxy manager available")
-		return
-	}
+	return
+}
 
 	targetData, err := parseTargetData(msg.Data)
 	if err != nil {