feat(telemetry): migrate Google Auth events to event-based logging and fix token storage metric

- Add GoogleAuthStartEvent and GoogleAuthEndEvent types
- Implement logGoogleAuthStart and logGoogleAuthEnd in telemetry loggers
- Update ClearcutLogger to support Google Auth events
- Update OAuth2 logic to use the new logging functions
- Fix missing 'type' attribute in recordTokenStorageInitialization metric

packages/core/src/code_assist/oauth2.test.ts

@@ -26,10 +26,7 @@ import {
   clearOauthClientCache,
   authEvents,
 } from './oauth2.js';
-import {
-  recordGoogleAuthStart,
-  recordGoogleAuthEnd,
-} from '../telemetry/metrics.js';
+import { logGoogleAuthStart, logGoogleAuthEnd } from '../telemetry/loggers.js';
 import { UserAccountManager } from '../utils/userAccountManager.js';
 import * as fs from 'node:fs';
 import * as path from 'node:path';
@@ -109,9 +106,9 @@ vi.mock('../mcp/token-storage/hybrid-token-storage.js', () => ({
   })),
 }));
 
-vi.mock('../telemetry/metrics.js', () => ({
-  recordGoogleAuthStart: vi.fn(),
-  recordGoogleAuthEnd: vi.fn(),
+vi.mock('../telemetry/loggers.js', () => ({
+  logGoogleAuthStart: vi.fn(),
+  logGoogleAuthEnd: vi.fn(),
 }));
 
 const mockConfig = {
@@ -1415,8 +1412,14 @@ describe('oauth2', () => {
 
         await getOauthClient(AuthType.LOGIN_WITH_GOOGLE, mockConfig);
 
-        expect(recordGoogleAuthStart).toHaveBeenCalledWith(mockConfig);
-        expect(recordGoogleAuthEnd).toHaveBeenCalledWith(mockConfig);
+        expect(logGoogleAuthStart).toHaveBeenCalledWith(
+          mockConfig,
+          expect.any(Object),
+        );
+        expect(logGoogleAuthEnd).toHaveBeenCalledWith(
+          mockConfig,
+          expect.any(Object),
+        );
       });
 
       it('should NOT record onboarding events for other auth types', async () => {

packages/core/src/code_assist/oauth2.ts

@@ -21,10 +21,11 @@ import { EventEmitter } from 'node:events';
 import open from 'open';
 import path from 'node:path';
 import { promises as fs } from 'node:fs';
+import { logGoogleAuthStart, logGoogleAuthEnd } from '../telemetry/loggers.js';
 import {
-  recordGoogleAuthStart,
-  recordGoogleAuthEnd,
-} from '../telemetry/metrics.js';
+  GoogleAuthStartEvent,
+  GoogleAuthEndEvent,
+} from '../telemetry/types.js';
 import type { Config } from '../config/config.js';
 import {
   getErrorMessage,
@@ -117,9 +118,9 @@ async function initOauthClient(
   authType: AuthType,
   config: Config,
 ): Promise<AuthClient> {
-  const recordGoogleAuthEndIfApplicable = () => {
+  const logGoogleAuthEndIfApplicable = () => {
     if (authType === AuthType.LOGIN_WITH_GOOGLE) {
-      recordGoogleAuthEnd(config);
+      logGoogleAuthEnd(config, new GoogleAuthEndEvent());
     }
   };
 
@@ -154,7 +155,7 @@ async function initOauthClient(
   });
 
   if (authType === AuthType.LOGIN_WITH_GOOGLE) {
-    recordGoogleAuthStart(config);
+    logGoogleAuthStart(config, new GoogleAuthStartEvent());
   }
 
   const useEncryptedStorage = getUseEncryptedStorageFlag();
@@ -203,7 +204,7 @@ async function initOauthClient(
         debugLogger.log('Loaded cached credentials.');
         await triggerPostAuthCallbacks(credentials as Credentials);
 
-        recordGoogleAuthEndIfApplicable();
+        logGoogleAuthEndIfApplicable();
         return client;
       }
     } catch (error) {
@@ -295,7 +296,7 @@ async function initOauthClient(
     }
 
     await triggerPostAuthCallbacks(client.credentials);
-    recordGoogleAuthEndIfApplicable();
+    logGoogleAuthEndIfApplicable();
   } else {
     // In ACP mode, we skip the interactive consent and directly open the browser
     if (!config.getAcpMode()) {
@@ -402,7 +403,7 @@ async function initOauthClient(
     });
 
     await triggerPostAuthCallbacks(client.credentials);
-    recordGoogleAuthEndIfApplicable();
+    logGoogleAuthEndIfApplicable();
   }
 
   return client;

packages/core/src/telemetry/clearcut-logger/clearcut-logger.ts

@@ -50,6 +50,8 @@ import type {
   KeychainAvailabilityEvent,
   TokenStorageInitializationEvent,
   StartupStatsEvent,
+  GoogleAuthStartEvent,
+  GoogleAuthEndEvent,
 } from '../types.js';
 import { EventMetadataKey } from './event-metadata-key.js';
 import type { Config } from '../../config/config.js';
@@ -116,6 +118,8 @@ export enum EventNames {
   TOOL_OUTPUT_MASKING = 'tool_output_masking',
   KEYCHAIN_AVAILABILITY = 'keychain_availability',
   TOKEN_STORAGE_INITIALIZATION = 'token_storage_initialization',
+  GOOGLE_AUTH_START = 'google_auth_start',
+  GOOGLE_AUTH_END = 'google_auth_end',
   CONSECA_POLICY_GENERATION = 'conseca_policy_generation',
   CONSECA_VERDICT = 'conseca_verdict',
   STARTUP_STATS = 'startup_stats',
@@ -1693,6 +1697,16 @@ export class ClearcutLogger {
     this.flushIfNeeded();
   }
 
+  logGoogleAuthStartEvent(_event: GoogleAuthStartEvent): void {
+    this.enqueueLogEvent(this.createLogEvent(EventNames.GOOGLE_AUTH_START, []));
+    this.flushIfNeeded();
+  }
+
+  logGoogleAuthEndEvent(_event: GoogleAuthEndEvent): void {
+    this.enqueueLogEvent(this.createLogEvent(EventNames.GOOGLE_AUTH_END, []));
+    this.flushIfNeeded();
+  }
+
   logStartupStatsEvent(event: StartupStatsEvent): void {
     const data: EventValue[] = [
       {

packages/core/src/telemetry/loggers.ts

@@ -56,6 +56,8 @@ import {
   type ToolOutputMaskingEvent,
   type KeychainAvailabilityEvent,
   type TokenStorageInitializationEvent,
+  type GoogleAuthStartEvent,
+  type GoogleAuthEndEvent,
 } from './types.js';
 import {
   recordApiErrorMetrics,
@@ -77,6 +79,8 @@ import {
   recordKeychainAvailability,
   recordTokenStorageInitialization,
   recordInvalidChunk,
+  recordGoogleAuthStart,
+  recordGoogleAuthEnd,
 } from './metrics.js';
 import { bufferTelemetryEvent } from './sdk.js';
 import { uiTelemetryService, type UiEvent } from './uiTelemetry.js';
@@ -844,6 +848,40 @@ export function logTokenStorageInitialization(
   });
 }
 
+export function logGoogleAuthStart(
+  config: Config,
+  event: GoogleAuthStartEvent,
+): void {
+  ClearcutLogger.getInstance(config)?.logGoogleAuthStartEvent(event);
+  bufferTelemetryEvent(() => {
+    const logger = logs.getLogger(SERVICE_NAME);
+    const logRecord: LogRecord = {
+      body: event.toLogBody(),
+      attributes: event.toOpenTelemetryAttributes(config),
+    };
+    logger.emit(logRecord);
+
+    recordGoogleAuthStart(config);
+  });
+}
+
+export function logGoogleAuthEnd(
+  config: Config,
+  event: GoogleAuthEndEvent,
+): void {
+  ClearcutLogger.getInstance(config)?.logGoogleAuthEndEvent(event);
+  bufferTelemetryEvent(() => {
+    const logger = logs.getLogger(SERVICE_NAME);
+    const logRecord: LogRecord = {
+      body: event.toLogBody(),
+      attributes: event.toOpenTelemetryAttributes(config),
+    };
+    logger.emit(logRecord);
+
+    recordGoogleAuthEnd(config);
+  });
+}
+
 export function logBillingEvent(
   config: Config,
   event: BillingTelemetryEvent,

packages/core/src/telemetry/metrics.ts

@@ -1397,6 +1397,7 @@ export function recordTokenStorageInitialization(
   tokenStorageTypeCounter.add(1, {
     ...baseMetricDefinition.getCommonAttributes(config),
     forced: event.forced,
+    type: event.type,
   });
 }
 

packages/core/src/telemetry/types.ts

@@ -2307,6 +2307,52 @@ export class KeychainAvailabilityEvent implements BaseTelemetryEvent {
   }
 }
 
+export const EVENT_GOOGLE_AUTH_START = 'gemini_cli.google_auth.start';
+export class GoogleAuthStartEvent implements BaseTelemetryEvent {
+  'event.name': 'google_auth_start';
+  'event.timestamp': string;
+
+  constructor() {
+    this['event.name'] = 'google_auth_start';
+    this['event.timestamp'] = new Date().toISOString();
+  }
+
+  toOpenTelemetryAttributes(config: Config): LogAttributes {
+    return {
+      ...getCommonAttributes(config),
+      'event.name': EVENT_GOOGLE_AUTH_START,
+      'event.timestamp': this['event.timestamp'],
+    };
+  }
+
+  toLogBody(): string {
+    return 'Google auth started.';
+  }
+}
+
+export const EVENT_GOOGLE_AUTH_END = 'gemini_cli.google_auth.end';
+export class GoogleAuthEndEvent implements BaseTelemetryEvent {
+  'event.name': 'google_auth_end';
+  'event.timestamp': string;
+
+  constructor() {
+    this['event.name'] = 'google_auth_end';
+    this['event.timestamp'] = new Date().toISOString();
+  }
+
+  toOpenTelemetryAttributes(config: Config): LogAttributes {
+    return {
+      ...getCommonAttributes(config),
+      'event.name': EVENT_GOOGLE_AUTH_END,
+      'event.timestamp': this['event.timestamp'],
+    };
+  }
+
+  toLogBody(): string {
+    return 'Google auth succeeded.';
+  }
+}
+
 export const EVENT_TOKEN_STORAGE_INITIALIZATION =
   'gemini_cli.token_storage.initialization';
 export class TokenStorageInitializationEvent implements BaseTelemetryEvent {