feat(telemetry): implement Clearcut logging for startup statistics (#21172)

Co-authored-by: Yuna Seol <yunaseol@google.com>

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

@@ -49,6 +49,7 @@ import type {
   ToolOutputMaskingEvent,
   KeychainAvailabilityEvent,
   TokenStorageInitializationEvent,
+  StartupStatsEvent,
 } from '../types.js';
 import { EventMetadataKey } from './event-metadata-key.js';
 import type { Config } from '../../config/config.js';
@@ -117,6 +118,7 @@ export enum EventNames {
   TOKEN_STORAGE_INITIALIZATION = 'token_storage_initialization',
   CONSECA_POLICY_GENERATION = 'conseca_policy_generation',
   CONSECA_VERDICT = 'conseca_verdict',
+  STARTUP_STATS = 'startup_stats',
 }
 
 export interface LogResponse {
@@ -1691,6 +1693,30 @@ export class ClearcutLogger {
     this.flushIfNeeded();
   }
 
+  logStartupStatsEvent(event: StartupStatsEvent): void {
+    const data: EventValue[] = [
+      {
+        gemini_cli_key: EventMetadataKey.GEMINI_CLI_STARTUP_PHASES,
+        value: JSON.stringify(event.phases),
+      },
+      {
+        gemini_cli_key: EventMetadataKey.GEMINI_CLI_STARTUP_OS_PLATFORM,
+        value: event.os_platform,
+      },
+      {
+        gemini_cli_key: EventMetadataKey.GEMINI_CLI_STARTUP_OS_RELEASE,
+        value: event.os_release,
+      },
+      {
+        gemini_cli_key: EventMetadataKey.GEMINI_CLI_STARTUP_IS_DOCKER,
+        value: JSON.stringify(event.is_docker),
+      },
+    ];
+
+    this.enqueueLogEvent(this.createLogEvent(EventNames.STARTUP_STATS, data));
+    this.flushIfNeeded();
+  }
+
   /**
    * Adds default fields to data, and returns a new data array.  This fields
    * should exist on all log events.

packages/core/src/telemetry/clearcut-logger/event-metadata-key.ts

@@ -7,7 +7,7 @@
 // Defines valid event metadata keys for Clearcut logging.
 export enum EventMetadataKey {
   // Deleted enums: 24
-  // Next ID: 172
+  // Next ID: 176
 
   GEMINI_CLI_KEY_UNKNOWN = 0,
 
@@ -54,6 +54,22 @@ export enum EventMetadataKey {
   // Logs the output format of the session.
   GEMINI_CLI_START_SESSION_OUTPUT_FORMAT = 94,
 
+  // ==========================================================================
+  // Startup Stats Event Keys
+  // ==========================================================================
+
+  // Logs the array of startup phases.
+  GEMINI_CLI_STARTUP_PHASES = 172,
+
+  // Logs the OS platform for startup stats.
+  GEMINI_CLI_STARTUP_OS_PLATFORM = 173,
+
+  // Logs the OS release for startup stats.
+  GEMINI_CLI_STARTUP_OS_RELEASE = 174,
+
+  // Logs whether the CLI is running in docker for startup stats.
+  GEMINI_CLI_STARTUP_IS_DOCKER = 175,
+
   // ==========================================================================
   // User Prompt Event Keys
   // ===========================================================================

packages/core/src/telemetry/loggers.ts

@@ -791,6 +791,7 @@ export function logStartupStats(
   config: Config,
   event: StartupStatsEvent,
 ): void {
+  ClearcutLogger.getInstance(config)?.logStartupStatsEvent(event);
   bufferTelemetryEvent(() => {
     // Wait for experiments to load before emitting so we capture experimentIds
     void config