diff --git a/src/common/__tests__/catalog-entity-registry.test.ts b/src/common/__tests__/catalog-entity-registry.test.ts
new file mode 100644
index 0000000000..da85af3e3d
--- /dev/null
+++ b/src/common/__tests__/catalog-entity-registry.test.ts
@@ -0,0 +1,63 @@
+import { observable, reaction } from "mobx";
+import { WebLink } from "../catalog-entities";
+import { CatalogEntityRegistry } from "../catalog-entity-registry";
+
+describe("CatalogEntityRegistry", () => {
+  let registry: CatalogEntityRegistry;
+  const entity = new WebLink({
+    apiVersion: "entity.k8slens.dev/v1alpha1",
+    kind: "WebLink",
+    metadata: {
+      uid: "test",
+      name: "test-link",
+      source: "test",
+      labels: {}
+    },
+    spec: {
+      url: "https://k8slens.dev"
+    },
+    status: {
+      phase: "ok"
+    }
+  });
+
+  beforeEach(() => {
+    registry = new CatalogEntityRegistry();
+  });
+
+  describe("addSource", () => {
+    it ("allows to add an observable source", () => {
+      const source = observable.array([]);
+
+      registry.addSource("test", source);
+      expect(registry.items.length).toEqual(0);
+
+      source.push(entity);
+
+      expect(registry.items.length).toEqual(1);
+    });
+
+    it ("added source change triggers reaction", (done) => {
+      const source = observable.array([]);
+
+      registry.addSource("test", source);
+      reaction(() => registry.items, () => {
+        done();
+      });
+
+      source.push(entity);
+    });
+  });
+
+  describe("removeSource", () => {
+    it ("removes source", () => {
+      const source = observable.array([]);
+
+      registry.addSource("test", source);
+      source.push(entity);
+      registry.removeSource("test");
+
+      expect(registry.items.length).toEqual(0);
+    });
+  });
+});
diff --git a/src/common/catalog-entities/web-link.ts b/src/common/catalog-entities/web-link.ts
index a8523408a3..db52fe0eb6 100644
--- a/src/common/catalog-entities/web-link.ts
+++ b/src/common/catalog-entities/web-link.ts
@@ -1,5 +1,5 @@
 import { observable } from "mobx";
-import { CatalogCategory, CatalogEntity, CatalogEntityMetadata, CatalogEntityStatus } from "../catalog-entity";
+import { CatalogCategory, CatalogEntity, CatalogEntityData, CatalogEntityMetadata, CatalogEntityStatus } from "../catalog-entity";
 import { catalogCategoryRegistry } from "../catalog-category-registry";
 
 export interface WebLinkStatus extends CatalogEntityStatus {
@@ -17,6 +17,12 @@ export class WebLink implements CatalogEntity {
   @observable public status: WebLinkStatus;
   @observable public spec: WebLinkSpec;
 
+  constructor(data: CatalogEntityData) {
+    this.metadata = data.metadata;
+    this.status = data.status as WebLinkStatus;
+    this.spec = data.spec as WebLinkSpec;
+  }
+
   getId() {
     return this.metadata.uid;
   }
diff --git a/src/common/catalog-entity-registry.ts b/src/common/catalog-entity-registry.ts
index e800fa88f9..28afa55bac 100644
--- a/src/common/catalog-entity-registry.ts
+++ b/src/common/catalog-entity-registry.ts
@@ -1,10 +1,10 @@
-import { action, computed, observable } from "mobx";
+import { action, computed, observable, IObservableArray } from "mobx";
 import { CatalogEntity } from "./catalog-entity";
 
 export class CatalogEntityRegistry {
-  protected sources = observable.map<string, CatalogEntity[]>([], { deep: true });
+  protected sources = observable.map<string, IObservableArray<CatalogEntity>>([], { deep: true });
 
-  @action addSource(id: string, source: CatalogEntity[]) {
+  @action addSource(id: string, source: IObservableArray<CatalogEntity>) {
     this.sources.set(id, source);
   }
 
@@ -12,14 +12,8 @@ export class CatalogEntityRegistry {
     this.sources.delete(id);
   }
 
-  @computed get items() {
-    const catalogItems: CatalogEntity[] = [];
-
-    for (const items of this.sources.values()) {
-      items.forEach((item) => catalogItems.push(item));
-    }
-
-    return catalogItems;
+  @computed get items(): CatalogEntity[] {
+    return Array.from(this.sources.values()).flat();
   }
 
   getItemsForApiKind<T extends CatalogEntity>(apiVersion: string, kind: string): T[] {
diff --git a/src/extensions/lens-main-extension.ts b/src/extensions/lens-main-extension.ts
index 1cfd3105b0..0ebb3d90f4 100644
--- a/src/extensions/lens-main-extension.ts
+++ b/src/extensions/lens-main-extension.ts
@@ -4,6 +4,7 @@ import { WindowManager } from "../main/window-manager";
 import { getExtensionPageUrl } from "./registries/page-registry";
 import { catalogEntityRegistry } from "../common/catalog-entity-registry";
 import { CatalogEntity } from "../common/catalog-entity";
+import { IObservableArray } from "mobx";
 
 export class LensMainExtension extends LensExtension {
   appMenus: MenuRegistration[] = [];
@@ -19,7 +20,7 @@ export class LensMainExtension extends LensExtension {
     await windowManager.navigate(pageUrl, frameId);
   }
 
-  addCatalogSource(id: string, source: CatalogEntity[]) {
+  addCatalogSource(id: string, source: IObservableArray<CatalogEntity>) {
     catalogEntityRegistry.addSource(`${this.name}:${id}`, source);
   }
 
diff --git a/src/main/cluster-manager.ts b/src/main/cluster-manager.ts
index c0ba24cc5d..047fb0ca95 100644
--- a/src/main/cluster-manager.ts
+++ b/src/main/cluster-manager.ts
@@ -14,7 +14,7 @@ import { catalogEntityRegistry } from "../common/catalog-entity-registry";
 const clusterOwnerRef = "ClusterManager";
 
 export class ClusterManager extends Singleton {
-  @observable.deep catalogSource: CatalogEntity[] = [];
+  catalogSource = observable.array<CatalogEntity>([]);
 
   constructor(public readonly port: number) {
     super();