Add route update metrics tracking to PrefixHandler

- Add RecordIPv4Update and RecordIPv6Update to metrics package
- Add SetMetricsTracker method to PrefixHandler
- Track IPv4/IPv6 route updates when processing announcements
- Add GetMetricsTracker method to Streamer to expose metrics

internal/routewatch/app.go

@@ -118,6 +118,7 @@ func (rw *RouteWatch) Run(ctx context.Context) error {
 
 		// PrefixHandler maintains the prefixes and live_routes tables
 		rw.prefixHandler = NewPrefixHandler(rw.db, rw.logger)
+		rw.prefixHandler.SetMetricsTracker(rw.streamer.GetMetricsTracker())
 		rw.streamer.RegisterHandler(rw.prefixHandler)
 
 		// PeeringHandler maintains the asn_peerings table

internal/routewatch/prefixhandler.go

@@ -8,6 +8,7 @@ import (
 
 	"git.eeqj.de/sneak/routewatch/internal/database"
 	"git.eeqj.de/sneak/routewatch/internal/logger"
+	"git.eeqj.de/sneak/routewatch/internal/metrics"
 	"git.eeqj.de/sneak/routewatch/internal/ristypes"
 	"github.com/google/uuid"
 )
@@ -30,8 +31,9 @@ const (
 // PrefixHandler tracks BGP prefixes and maintains a live routing table in the database.
 // Routes are added on announcement and deleted on withdrawal.
 type PrefixHandler struct {
-	db     database.Store
-	logger *logger.Logger
+	db      database.Store
+	logger  *logger.Logger
+	metrics *metrics.Tracker
 
 	// Batching
 	mu        sync.Mutex
@@ -67,6 +69,11 @@ func NewPrefixHandler(db database.Store, logger *logger.Logger) *PrefixHandler {
 	return h
 }
 
+// SetMetricsTracker sets the metrics tracker for recording route updates
+func (h *PrefixHandler) SetMetricsTracker(metrics *metrics.Tracker) {
+	h.metrics = metrics
+}
+
 // WantsMessage returns true if this handler wants to process messages of the given type
 func (h *PrefixHandler) WantsMessage(messageType string) bool {
 	// We only care about UPDATE messages for the routing table
@@ -220,6 +227,15 @@ func (h *PrefixHandler) processAnnouncement(_ *database.Prefix, update prefixUpd
 		return
 	}
 
+	// Track route update metrics
+	if h.metrics != nil {
+		if ipVersion == ipv4Version {
+			h.metrics.RecordIPv4Update()
+		} else {
+			h.metrics.RecordIPv6Update()
+		}
+	}
+
 	// Create live route record
 	liveRoute := &database.LiveRoute{
 		ID:          uuid.New(),