feat(telemetry): expand cli configuration event

Adds the following attributes to the  event:
- embedding_model
- api_key_enabled
- code_assist_enabled
- debug_mode
- mcp_servers

This additional data will provide more insight into user configurations.

docs/core/telemetry.md

@@ -262,13 +262,18 @@ These are timestamped records of specific events.
 
   - **Attributes**:
     - `model` (string)
+    - `embedding_model` (string)
     - `sandbox_enabled` (boolean)
     - `core_tools_enabled` (string)
     - `approval_mode` (string)
+    - `api_key_enabled` (boolean)
     - `vertex_ai_enabled` (boolean)
+    - `code_assist_enabled` (boolean)
     - `log_user_prompts_enabled` (boolean)
     - `file_filtering_respect_git_ignore` (boolean)
     - `file_filtering_allow_build_artifacts` (boolean)
+    - `debug_mode` (boolean)
+    - `mcp_servers` (string)
 
 - `gemini_cli.user_prompt`: Fired when a user submits a prompt.
 

packages/core/src/telemetry/loggers.test.ts

@@ -8,36 +8,101 @@ import { logs } from '@opentelemetry/api-logs';
 import { SemanticAttributes } from '@opentelemetry/semantic-conventions';
 import { Config } from '../config/config.js';
 import { EVENT_API_RESPONSE } from './constants.js';
-import { logApiResponse } from './loggers.js';
+import { logApiResponse, logCliConfiguration } from './loggers.js';
 import * as metrics from './metrics.js';
 import * as sdk from './sdk.js';
 import { vi, describe, beforeEach, it, expect } from 'vitest';
 
-describe('logApiResponse', () => {
+vi.mock('@gemini-cli/cli/dist/src/utils/version', () => ({
-  const mockConfig = {
+  getCliVersion: () => 'test-version',
-    getSessionId: () => 'test-session-id',
+}));
-  } as Config;
 
+vi.mock('@gemini-cli/cli/dist/src/config/settings', () => ({
+  getTheme: () => 'test-theme',
+}));
+
+describe('loggers', () => {
   const mockLogger = {
     emit: vi.fn(),
   };
 
+  beforeEach(() => {
+    vi.spyOn(sdk, 'isTelemetrySdkInitialized').mockReturnValue(true);
+    vi.spyOn(logs, 'getLogger').mockReturnValue(mockLogger);
+    vi.useFakeTimers();
+    vi.setSystemTime(new Date('2025-01-01T00:00:00.000Z'));
+  });
+
+  describe('logCliConfiguration', () => {
+    it('should log the cli configuration', () => {
+      const mockConfig = {
+        getSessionId: () => 'test-session-id',
+        getModel: () => 'test-model',
+        getEmbeddingModel: () => 'test-embedding-model',
+        getSandbox: () => true,
+        getCoreTools: () => ['ls', 'read-file'],
+        getApprovalMode: () => 'default',
+        getContentGeneratorConfig: () => ({
+          model: 'test-model',
+          apiKey: 'test-api-key',
+          vertexai: true,
+          codeAssist: false,
+        }),
+        getTelemetryLogUserPromptsEnabled: () => true,
+        getFileFilteringRespectGitIgnore: () => true,
+        getFileFilteringAllowBuildArtifacts: () => false,
+        getDebugMode: () => true,
+        getMcpServers: () => ({
+          'test-server': {
+            command: 'test-command',
+          },
+        }),
+        getQuestion: () => 'test-question',
+      } as unknown as Config;
+
+      logCliConfiguration(mockConfig);
+
+      expect(mockLogger.emit).toHaveBeenCalledWith({
+        body: 'CLI configuration loaded.',
+        attributes: {
+          'session.id': 'test-session-id',
+          'event.name': 'gemini_cli.config',
+          'event.timestamp': '2025-01-01T00:00:00.000Z',
+          model: 'test-model',
+          embedding_model: 'test-embedding-model',
+          sandbox_enabled: true,
+          core_tools_enabled: 'ls,read-file',
+          approval_mode: 'default',
+          api_key_enabled: true,
+          vertex_ai_enabled: true,
+          code_assist_enabled: false,
+          log_user_prompts_enabled: true,
+          file_filtering_respect_git_ignore: true,
+          file_filtering_allow_build_artifacts: false,
+          debug_mode: true,
+          mcp_servers: 'test-server',
+        },
+      });
+    });
+  });
+
+  describe('logApiResponse', () => {
+    const mockConfig = {
+      getSessionId: () => 'test-session-id',
+    } as Config;
+
     const mockMetrics = {
       recordApiResponseMetrics: vi.fn(),
       recordTokenUsageMetrics: vi.fn(),
     };
 
     beforeEach(() => {
-    vi.spyOn(sdk, 'isTelemetrySdkInitialized').mockReturnValue(true);
-    vi.spyOn(logs, 'getLogger').mockReturnValue(mockLogger);
       vi.spyOn(metrics, 'recordApiResponseMetrics').mockImplementation(
         mockMetrics.recordApiResponseMetrics,
       );
       vi.spyOn(metrics, 'recordTokenUsageMetrics').mockImplementation(
         mockMetrics.recordTokenUsageMetrics,
       );
-    vi.useFakeTimers();
-    vi.setSystemTime(new Date('2025-01-01T00:00:00.000Z'));
     });
 
     it('should log an API response with all fields', () => {
@@ -116,4 +181,5 @@ describe('logApiResponse', () => {
         },
       });
     });
+  });
 });

packages/core/src/telemetry/loggers.ts

@@ -43,21 +43,28 @@ function getCommonAttributes(config: Config): LogAttributes {
 export function logCliConfiguration(config: Config): void {
   if (!isTelemetrySdkInitialized()) return;
 
+  const generatorConfig = config.getContentGeneratorConfig();
+  const mcpServers = config.getMcpServers();
   const attributes: LogAttributes = {
     ...getCommonAttributes(config),
     'event.name': EVENT_CLI_CONFIG,
     'event.timestamp': new Date().toISOString(),
     model: config.getModel(),
+    embedding_model: config.getEmbeddingModel(),
     sandbox_enabled:
       typeof config.getSandbox() === 'string' ? true : config.getSandbox(),
     core_tools_enabled: (config.getCoreTools() ?? []).join(','),
     approval_mode: config.getApprovalMode(),
-    vertex_ai_enabled: !!config.getContentGeneratorConfig().vertexai,
+    api_key_enabled: !!generatorConfig.apiKey,
+    vertex_ai_enabled: !!generatorConfig.vertexai,
+    code_assist_enabled: !!generatorConfig.codeAssist,
     log_user_prompts_enabled: config.getTelemetryLogUserPromptsEnabled(),
     file_filtering_respect_git_ignore:
       config.getFileFilteringRespectGitIgnore(),
     file_filtering_allow_build_artifacts:
       config.getFileFilteringAllowBuildArtifacts(),
+    debug_mode: config.getDebugMode(),
+    mcp_servers: mcpServers ? Object.keys(mcpServers).join(',') : '',
   };
   const logger = logs.getLogger(SERVICE_NAME);
   const logRecord: LogRecord = {