diff --git a/ipn/ipnlocal/c2n_test.go b/ipn/ipnlocal/c2n_test.go
index aefc1694b..e5b15e79a 100644
--- a/ipn/ipnlocal/c2n_test.go
+++ b/ipn/ipnlocal/c2n_test.go
@@ -16,6 +16,7 @@ import (
 	"testing"
 	"time"
 
+	"tailscale.com/health"
 	"tailscale.com/ipn/store/mem"
 	"tailscale.com/tailcfg"
 	"tailscale.com/tstest"
@@ -23,6 +24,7 @@ import (
 	"tailscale.com/types/logger"
 	"tailscale.com/types/netmap"
 	"tailscale.com/types/views"
+	"tailscale.com/util/eventbus/eventbustest"
 	"tailscale.com/util/must"
 
 	gcmp "github.com/google/go-cmp/cmp"
@@ -33,6 +35,7 @@ func TestHandleC2NTLSCertStatus(t *testing.T) {
 	b := &LocalBackend{
 		store:   &mem.Store{},
 		varRoot: t.TempDir(),
+		health:  health.NewTracker(eventbustest.NewBus(t)),
 	}
 	certDir, err := b.certDir()
 	if err != nil {
diff --git a/ipn/ipnlocal/local_test.go b/ipn/ipnlocal/local_test.go
index ed4df6b44..d930735cd 100644
--- a/ipn/ipnlocal/local_test.go
+++ b/ipn/ipnlocal/local_test.go
@@ -7763,6 +7763,7 @@ func TestStripKeysFromPrefs(t *testing.T) {
 			ch := make(chan *ipn.Notify, 1)
 			b := &LocalBackend{
 				extHost: h,
+				health:  health.NewTracker(eventbustest.NewBus(t)),
 				notifyWatchers: map[string]*watchSession{
 					"test": {ch: ch},
 				},
diff --git a/ipn/ipnlocal/network-lock_test.go b/ipn/ipnlocal/network-lock_test.go
index 178b8dfac..eead2d892 100644
--- a/ipn/ipnlocal/network-lock_test.go
+++ b/ipn/ipnlocal/network-lock_test.go
@@ -158,6 +158,7 @@ func TestTKAEnablementFlow(t *testing.T) {
 		cc:             cc,
 		ccAuto:         cc,
 		logf:           t.Logf,
+		health:         health.NewTracker(eventbustest.NewBus(t)),
 		pm:             pm,
 		store:          pm.Store(),
 	}
@@ -244,6 +245,7 @@ func TestTKADisablementFlow(t *testing.T) {
 		cc:      cc,
 		ccAuto:  cc,
 		logf:    t.Logf,
+		health:  health.NewTracker(eventbustest.NewBus(t)),
 		tka: &tkaState{
 			authority: authority,
 			storage:   chonk,
@@ -428,6 +430,7 @@ func TestTKASync(t *testing.T) {
 				cc:      cc,
 				ccAuto:  cc,
 				logf:    t.Logf,
+				health:  health.NewTracker(eventbustest.NewBus(t)),
 				pm:      pm,
 				store:   pm.Store(),
 				tka: &tkaState{
@@ -544,6 +547,7 @@ func TestTKASyncTriggersCompact(t *testing.T) {
 		cc:     cc,
 		ccAuto: cc,
 		logf:   t.Logf,
+		health: health.NewTracker(eventbustest.NewBus(t)),
 		pm:     pm,
 		store:  pm.Store(),
 		tka: &tkaState{
@@ -616,8 +620,9 @@ func TestTKAFilterNetmap(t *testing.T) {
 	}
 
 	b := &LocalBackend{
-		logf: t.Logf,
-		tka:  &tkaState{authority: authority},
+		logf:   t.Logf,
+		health: health.NewTracker(eventbustest.NewBus(t)),
+		tka:    &tkaState{authority: authority},
 	}
 
 	n1, n2, n3, n4, n5 := key.NewNode(), key.NewNode(), key.NewNode(), key.NewNode(), key.NewNode()
@@ -822,6 +827,7 @@ func TestTKADisable(t *testing.T) {
 		cc:      cc,
 		ccAuto:  cc,
 		logf:    t.Logf,
+		health:  health.NewTracker(eventbustest.NewBus(t)),
 		tka: &tkaState{
 			profile:   pm.CurrentProfile().ID(),
 			authority: authority,
@@ -887,6 +893,7 @@ func TestTKASign(t *testing.T) {
 		cc:      cc,
 		ccAuto:  cc,
 		logf:    t.Logf,
+		health:  health.NewTracker(eventbustest.NewBus(t)),
 		tka: &tkaState{
 			authority: authority,
 			storage:   chonk,
@@ -1083,6 +1090,7 @@ func TestTKAAffectedSigs(t *testing.T) {
 				cc:      cc,
 				ccAuto:  cc,
 				logf:    t.Logf,
+				health:  health.NewTracker(eventbustest.NewBus(t)),
 				tka: &tkaState{
 					authority: authority,
 					storage:   chonk,
@@ -1168,6 +1176,7 @@ func TestTKARecoverCompromisedKeyFlow(t *testing.T) {
 		cc:      cc,
 		ccAuto:  cc,
 		logf:    t.Logf,
+		health:  health.NewTracker(eventbustest.NewBus(t)),
 		tka: &tkaState{
 			authority: authority,
 			storage:   chonk,
@@ -1187,6 +1196,7 @@ func TestTKARecoverCompromisedKeyFlow(t *testing.T) {
 		b := LocalBackend{
 			varRoot: temp,
 			logf:    t.Logf,
+			health:  health.NewTracker(eventbustest.NewBus(t)),
 			tka: &tkaState{
 				authority: authority,
 				storage:   chonk,
diff --git a/ipn/ipnlocal/serve_test.go b/ipn/ipnlocal/serve_test.go
index 0ba43a5f9..05f4936b2 100644
--- a/ipn/ipnlocal/serve_test.go
+++ b/ipn/ipnlocal/serve_test.go
@@ -194,6 +194,7 @@ func TestGetServeHandler(t *testing.T) {
 			b := &LocalBackend{
 				serveConfig: tt.conf.View(),
 				logf:        t.Logf,
+				health:      health.NewTracker(eventbustest.NewBus(t)),
 			}
 			req := &http.Request{
 				URL: &url.URL{
@@ -1191,7 +1192,9 @@ func TestServeFileOrDirectory(t *testing.T) {
 		}
 	}
 
-	b := &LocalBackend{}
+	b := &LocalBackend{
+		health: health.NewTracker(eventbustest.NewBus(t)),
+	}
 
 	tests := []struct {
 		req   string