update to just config reading-based

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

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

@@ -14,19 +14,19 @@
  * limitations under the License.
  */
 
-import { Observable } from '@backstage/types';
-
-/**
- * @public
- */
-export interface BackstageInstance {
-  internalUrl: string;
-  externalUrl: string;
+/** @public */
+export interface RootSystemMetadataServicePluginInfo {
+  readonly pluginId: string;
+  readonly hosts: (string | { external: string; internal: string })[];
 }
 
-/**
- * @public
- */
-export interface SystemMetadataService {
-  instances(): Observable<BackstageInstance[]>;
+/** @public */
+export interface RootSystemMetadataService {
+  getInstalledPlugins: () => Promise<
+    ReadonlyArray<RootSystemMetadataServicePluginInfo>
+  >;
+
+  getHosts: () => Promise<
+    ReadonlyArray<string | { external: string; internal: string }>
+  >;
 }

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

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

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

@@ -73,9 +73,9 @@ export type {
   SchedulerServiceTaskScheduleDefinitionConfig,
 } from './SchedulerService';
 export type {
-  BackstageInstance,
-  SystemMetadataService,
-} from './SystemMetadataService';
+  RootSystemMetadataServicePluginInfo,
+  RootSystemMetadataService,
+} from './RootSystemMetadataService';
 export type {
   UrlReaderService,
   UrlReaderServiceReadTreeOptions,