diff --git a/doc/thinking/2026-04-26-namespace-manager-step22.md b/doc/thinking/2026-04-26-namespace-manager-step22.md
new file mode 100644
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+++ b/doc/thinking/2026-04-26-namespace-manager-step22.md
@@ -0,0 +1,17 @@
+# 2026-04-26 — NamespaceManager rewrite, step 22
+
+## Цель шага
+
+Добавить первый runtime adapter для `router` по тому же шаблону, что и для `buildermgr`.
+
+## Что меняем
+
+1. Добавляем router namespace subscriber.
+2. Adapter переиспользует существующий `HTTPTriggerSet.AddNamespace()`.
+3. `add/resync` path прогоняется через общий helper.
+
+## Что НЕ меняем
+
+- не подключаем subscriber к `StartNSWatcher()`;
+- не меняем remove path;
+- не меняем текущий production flow.
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diff --git a/pkg/router/namespace_subscriber.go b/pkg/router/namespace_subscriber.go
new file mode 100644
index 00000000..ce40e53f
--- /dev/null
+++ b/pkg/router/namespace_subscriber.go
@@ -0,0 +1,32 @@
+package main
+package router
+
+import (
+	"context"
+
+	"github.com/fission/fission/pkg/utils"
+	"github.com/fission/fission/pkg/utils/manager"
+)
+
+type routerNamespaceAdder interface {
+	AddNamespace(ctx context.Context, ns string, mgr manager.Interface) error
+}
+
+func NewNamespaceSubscriber(ts routerNamespaceAdder, mgr manager.Interface) utils.NamespaceSubscriber {
+	return utils.NamespaceSubscriberFuncs{
+		SubscriberName: "router",
+		AddFunc: func(ctx context.Context, record utils.NamespaceRecord) error {
+			return registerRouterNamespace(ctx, record.Name, ts, mgr)
+		},
+		ResyncFunc: func(ctx context.Context, record utils.NamespaceRecord) error {
+			return registerRouterNamespace(ctx, record.Name, ts, mgr)
+		},
+	}
+}
+
+func registerRouterNamespace(ctx context.Context, namespace string, ts routerNamespaceAdder, mgr manager.Interface) error {
+	if namespace == "" || ts == nil {
+		return nil
+	}
+	return ts.AddNamespace(ctx, namespace, mgr)
+}
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diff --git a/pkg/router/namespace_subscriber_test.go b/pkg/router/namespace_subscriber_test.go
new file mode 100644
index 00000000..d0d9b0d0
--- /dev/null
+++ b/pkg/router/namespace_subscriber_test.go
@@ -0,0 +1,52 @@
+package router
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"github.com/fission/fission/pkg/utils"
+	"github.com/fission/fission/pkg/utils/manager"
+)
+
+type fakeRouterNamespaceAdder struct {
+	lastNamespace string
+	calls         int
+	err           error
+}
+
+func (f *fakeRouterNamespaceAdder) AddNamespace(ctx context.Context, ns string, mgr manager.Interface) error {
+	f.lastNamespace = ns
+	f.calls++
+	return f.err
+}
+
+func TestNewNamespaceSubscriberAddAndResync(t *testing.T) {
+	adder := &fakeRouterNamespaceAdder{}
+	subscriber := NewNamespaceSubscriber(adder, nil)
+	record := utils.NamespaceRecord{Name: "tenant-router-a"}
+
+	if subscriber.Name() != "router" {
+		t.Fatalf("expected router subscriber name")
+	}
+	if err := subscriber.OnNamespaceAdd(context.Background(), record); err != nil {
+		t.Fatalf("expected add to succeed: %v", err)
+	}
+	if err := subscriber.OnNamespaceResync(context.Background(), record); err != nil {
+		t.Fatalf("expected resync to succeed: %v", err)
+	}
+	if adder.calls != 2 {
+		t.Fatalf("expected adder to be called for add and resync")
+	}
+	if adder.lastNamespace != "tenant-router-a" {
+		t.Fatalf("expected namespace to be forwarded")
+	}
+}
+
+func TestRegisterRouterNamespacePropagatesError(t *testing.T) {
+	adder := &fakeRouterNamespaceAdder{err: errors.New("add failed")}
+	err := registerRouterNamespace(context.Background(), "tenant-router-a", adder, nil)
+	if err == nil || err.Error() != "add failed" {
+		t.Fatalf("expected router add error to be propagated, got %v", err)
+	}
+}
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