diff --git a/snow/engine/avalanche/bootstrapper_test.go b/snow/engine/avalanche/bootstrapper_test.go
index c89926e..e0a9d56 100644
--- a/snow/engine/avalanche/bootstrapper_test.go
+++ b/snow/engine/avalanche/bootstrapper_test.go
@@ -58,7 +58,13 @@ func newConfig(t *testing.T) (BootstrapConfig, ids.ShortID, *common.SenderTest,
 	peerID := peer.ID()
 	peers.Add(peer)
 
-	handler.Initialize(engine, make(chan common.Message), 1)
+	handler.Initialize(
+		engine,
+		make(chan common.Message),
+		1,
+		"",
+		prometheus.NewRegistry(),
+	)
 	timeouts.Initialize(0)
 	router.Initialize(ctx.Log, timeouts, time.Hour, time.Second)
 
diff --git a/snow/engine/avalanche/vertex_heap.go b/snow/engine/avalanche/vertex_heap.go
index 59fff2e..7c68294 100644
--- a/snow/engine/avalanche/vertex_heap.go
+++ b/snow/engine/avalanche/vertex_heap.go
@@ -72,7 +72,7 @@ type maxHeightVertexHeap struct {
 	elementIDs ids.Set
 }
 
-func NewMaxVertexHeap() *maxHeightVertexHeap {
+func newMaxVertexHeap() *maxHeightVertexHeap {
 	return &maxHeightVertexHeap{
 		heap:       &priorityQueue{},
 		elementIDs: ids.Set{},
diff --git a/snow/engine/avalanche/vertex_heap_test.go b/snow/engine/avalanche/vertex_heap_test.go
index 5f27a18..f8ea16f 100644
--- a/snow/engine/avalanche/vertex_heap_test.go
+++ b/snow/engine/avalanche/vertex_heap_test.go
@@ -10,7 +10,7 @@ import (
 // This example inserts several ints into an IntHeap, checks the minimum,
 // and removes them in order of priority.
 func TestUniqueVertexHeapReturnsOrdered(t *testing.T) {
-	h := NewMaxVertexHeap()
+	h := newMaxVertexHeap()
 
 	vtx0 := &Vtx{
 		id:     GenerateID(),
@@ -90,7 +90,7 @@ func TestUniqueVertexHeapReturnsOrdered(t *testing.T) {
 }
 
 func TestUniqueVertexHeapRemainsUnique(t *testing.T) {
-	h := NewMaxVertexHeap()
+	h := newMaxVertexHeap()
 
 	vtx0 := &Vtx{
 		height: 0,
diff --git a/snow/engine/avalanche/voter.go b/snow/engine/avalanche/voter.go
index f97992a..cb613d0 100644
--- a/snow/engine/avalanche/voter.go
+++ b/snow/engine/avalanche/voter.go
@@ -69,7 +69,7 @@ func (v *voter) Update() {
 
 func (v *voter) bubbleVotes(votes ids.UniqueBag) ids.UniqueBag {
 	bubbledVotes := ids.UniqueBag{}
-	vertexHeap := NewMaxVertexHeap()
+	vertexHeap := newMaxVertexHeap()
 	for _, vote := range votes.List() {
 		vtx, err := v.t.Config.State.GetVertex(vote)
 		if err != nil {
diff --git a/snow/engine/snowman/bootstrapper_test.go b/snow/engine/snowman/bootstrapper_test.go
index 3576f88..2e39da6 100644
--- a/snow/engine/snowman/bootstrapper_test.go
+++ b/snow/engine/snowman/bootstrapper_test.go
@@ -52,7 +52,13 @@ func newConfig(t *testing.T) (BootstrapConfig, ids.ShortID, *common.SenderTest,
 	peerID := peer.ID()
 	peers.Add(peer)
 
-	handler.Initialize(engine, make(chan common.Message), 1)
+	handler.Initialize(
+		engine,
+		make(chan common.Message),
+		1,
+		"",
+		prometheus.NewRegistry(),
+	)
 	timeouts.Initialize(0)
 	router.Initialize(ctx.Log, timeouts, time.Hour, time.Second)
 
diff --git a/snow/networking/sender/sender_test.go b/snow/networking/sender/sender_test.go
index 45286fa..7760307 100644
--- a/snow/networking/sender/sender_test.go
+++ b/snow/networking/sender/sender_test.go
@@ -15,6 +15,7 @@ import (
 	"github.com/ava-labs/gecko/snow/networking/router"
 	"github.com/ava-labs/gecko/snow/networking/timeout"
 	"github.com/ava-labs/gecko/utils/logging"
+	"github.com/prometheus/client_golang/prometheus"
 )
 
 func TestSenderContext(t *testing.T) {
@@ -58,7 +59,13 @@ func TestTimeout(t *testing.T) {
 	}
 
 	handler := router.Handler{}
-	handler.Initialize(&engine, nil, 1)
+	handler.Initialize(
+		&engine,
+		nil,
+		1,
+		"",
+		prometheus.NewRegistry(),
+	)
 	go handler.Dispatch()
 
 	chainRouter.AddChain(&handler)
diff --git a/vms/platformvm/vm_test.go b/vms/platformvm/vm_test.go
index fd782f7..8532559 100644
--- a/vms/platformvm/vm_test.go
+++ b/vms/platformvm/vm_test.go
@@ -1597,7 +1597,13 @@ func TestBootstrapPartiallyAccepted(t *testing.T) {
 
 	// Asynchronously passes messages from the network to the consensus engine
 	handler := &router.Handler{}
-	handler.Initialize(&engine, msgChan, 1000)
+	handler.Initialize(
+		&engine,
+		msgChan,
+		1000,
+		"",
+		prometheus.NewRegistry(),
+	)
 
 	// Allow incoming messages to be routed to the new chain
 	chainRouter.AddChain(handler)
diff --git a/vms/spchainvm/consensus_benchmark_test.go b/vms/spchainvm/consensus_benchmark_test.go
index 5dcc247..ed96adf 100644
--- a/vms/spchainvm/consensus_benchmark_test.go
+++ b/vms/spchainvm/consensus_benchmark_test.go
@@ -105,7 +105,13 @@ func ConsensusLeader(numBlocks, numTxsPerBlock int, b *testing.B) {
 
 		// Asynchronously passes messages from the network to the consensus engine
 		handler := &router.Handler{}
-		handler.Initialize(&engine, msgChan, 1000)
+		handler.Initialize(
+			&engine,
+			msgChan,
+			1000,
+			"",
+			prometheus.NewRegistry(),
+		)
 
 		// Allow incoming messages to be routed to the new chain
 		chainRouter.AddChain(handler)
@@ -238,7 +244,13 @@ func ConsensusFollower(numBlocks, numTxsPerBlock int, b *testing.B) {
 
 		// Asynchronously passes messages from the network to the consensus engine
 		handler := &router.Handler{}
-		handler.Initialize(&engine, msgChan, 1000)
+		handler.Initialize(
+			&engine,
+			msgChan,
+			1000,
+			"",
+			prometheus.NewRegistry(),
+		)
 
 		// Allow incoming messages to be routed to the new chain
 		chainRouter.AddChain(handler)