Add usage limit remaining in /stats (#13843)

packages/core/src/code_assist/server.ts

@@ -14,6 +14,8 @@ import type {
   OnboardUserRequest,
   SetCodeAssistGlobalUserSettingRequest,
   ClientMetadata,
+  RetrieveUserQuotaRequest,
+  RetrieveUserQuotaResponse,
 } from './types.js';
 import type {
   ListExperimentsRequest,
@@ -171,6 +173,15 @@ export class CodeAssistServer implements ContentGenerator {
     );
   }
 
+  async retrieveUserQuota(
+    req: RetrieveUserQuotaRequest,
+  ): Promise<RetrieveUserQuotaResponse> {
+    return await this.requestPost<RetrieveUserQuotaResponse>(
+      'retrieveUserQuota',
+      req,
+    );
+  }
+
   async requestPost<T>(
     method: string,
     req: object,