clean up PR following review

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

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

@@ -26,17 +26,6 @@ export { actionsRegistryServiceRef, actionsServiceRef } from './refs';
 
 import { createServiceRef } from '@backstage/backend-plugin-api';
 
-/**
- * EXPERIMENTAL: System metadata service.
- * @alpha
- */
-export const systemMetadataServiceRef = createServiceRef<
-  import('./services/definitions/SystemMetadataService').SystemMetadataService
->({
-  id: 'core.systemMetadata',
-  scope: 'root',
-});
-
 export type {
   BackstageInstance,
   SystemMetadataService,

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

@@ -26,5 +26,5 @@ export interface BackstageInstance {
  * @alpha
  */
 export interface SystemMetadataService {
-  listInstances(): Promise<BackstageInstance[]>;
+  introspect(): Promise<{ instances: BackstageInstance[] }>;
 }

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

@@ -289,4 +289,15 @@ export namespace coreServices {
     id: 'core.rootInstanceMetadata',
     scope: 'root',
   });
+  
+  /**
+   * Read information about your current Backstage deployment.
+   * @alpha
+   */
+  export const systemMetadataServiceRef = createServiceRef<
+    import('./SystemMetadataService').SystemMetadataService
+  >({
+    id: 'core.systemMetadata',
+    scope: 'root',
+  });
 }