remove experimental service from core services

Signed-off-by: aramissennyeydd <aramis.sennyey@doordash.com>

packages/backend-app-api/src/wiring/BackendInitializer.ts

@@ -35,7 +35,11 @@ import type {
 // eslint-disable-next-line @backstage/no-relative-monorepo-imports
 import type { InternalServiceFactory } from '../../../backend-plugin-api/src/services/system/types';
 import { ForwardedError, ConflictError } from '@backstage/errors';
-import { featureDiscoveryServiceRef } from '@backstage/backend-plugin-api/alpha';
+import {
+  experimentalServices,
+  featureDiscoveryServiceRef,
+  BackendFeatureMeta,
+} from '@backstage/backend-plugin-api/alpha';
 import { DependencyGraph } from '../lib/DependencyGraph';
 import { ServiceRegistry } from './ServiceRegistry';
 import { createInitializationLogger } from './createInitializationLogger';
@@ -97,18 +101,6 @@ const instanceRegistry = new (class InstanceRegistry {
   };
 })();
 
-// Duplicating from `@backstage/backend-plugin-api` to avoid a deep import.
-type BackendFeatureMeta =
-  | {
-      type: 'plugin';
-      pluginId: string;
-    }
-  | {
-      type: 'module';
-      pluginId: string;
-      moduleId: string;
-    };
-
 function createInstanceMetadataServiceFactory(
   registrations: InternalBackendRegistrations[],
 ) {
@@ -136,7 +128,7 @@ function createInstanceMetadataServiceFactory(
     })
     .flat();
   return createServiceFactory({
-    service: coreServices.EXPERIMENTAL_instanceMetadata,
+    service: experimentalServices.EXPERIMENTAL_instanceMetadata,
     deps: {},
     factory: async () => ({ getInstalledFeatures: () => installedFeatures }),
   });

packages/backend-plugin-api/src/alpha.ts

@@ -34,3 +34,6 @@ export const featureDiscoveryServiceRef =
     id: 'core.featureDiscovery',
     scope: 'root',
   });
+
+export { experimentalServices } from './services/definitions/experimentalServices';
+export type { BackendFeatureMeta } from './services/definitions/InstanceMetadataService';

packages/backend-plugin-api/src/services/definitions/coreServices.ts

@@ -251,15 +251,4 @@ export namespace coreServices {
   export const urlReader = createServiceRef<
     import('./UrlReaderService').UrlReaderService
   >({ id: 'core.urlReader' });
-
-  /**
-   * EXPERIMENTAL: Instance metadata service.
-   *
-   * @public
-   */
-  export const EXPERIMENTAL_instanceMetadata = createServiceRef<
-    import('./InstanceMetadataService').InstanceMetadataService
-  >({
-    id: 'core.instanceMetadata',
-  });
 }

packages/backend-plugin-api/src/services/definitions/experimentalServices.ts

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2024 The Backstage Authors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import { createServiceRef } from '../system';
+
+export namespace experimentalServices {
+  /**
+   * EXPERIMENTAL: Instance metadata service.
+   *
+   * @public
+   */
+  export const EXPERIMENTAL_instanceMetadata = createServiceRef<
+    import('./InstanceMetadataService').InstanceMetadataService
+  >({
+    id: 'core.instanceMetadata',
+  });
+}

packages/backend/src/instanceMetadata.ts

@@ -17,6 +17,7 @@ import {
   coreServices,
   createBackendPlugin,
 } from '@backstage/backend-plugin-api';
+import { experimentalServices } from '@backstage/backend-plugin-api/alpha';
 
 // Example usage of the instance metadata service to log the installed features.
 export default createBackendPlugin({
@@ -24,7 +25,7 @@ export default createBackendPlugin({
   register(env) {
     env.registerInit({
       deps: {
-        instanceMetadata: coreServices.EXPERIMENTAL_instanceMetadata,
+        instanceMetadata: experimentalServices.EXPERIMENTAL_instanceMetadata,
         logger: coreServices.logger,
       },
       async init({ instanceMetadata, logger }) {