feat: Add OTEL log event gemini_cli.startup_stats for startup stats. (#14734)

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

@@ -13,6 +13,11 @@ vi.mock('./metrics.js', () => ({
   recordStartupPerformance: vi.fn(),
 }));
 
+// Mock loggers module
+vi.mock('./loggers.js', () => ({
+  logStartupStats: vi.fn(),
+}));
+
 // Mock os module
 vi.mock('node:os', () => ({
   platform: vi.fn(() => 'darwin'),
@@ -33,6 +38,7 @@ describe('StartupProfiler', () => {
   let profiler: StartupProfiler;
   let mockConfig: Config;
   let recordStartupPerformance: ReturnType<typeof vi.fn>;
+  let logStartupStats: ReturnType<typeof vi.fn>;
 
   beforeEach(async () => {
     vi.resetAllMocks();
@@ -42,6 +48,9 @@ describe('StartupProfiler', () => {
     recordStartupPerformance =
       metricsModule.recordStartupPerformance as ReturnType<typeof vi.fn>;
 
+    const loggersModule = await import('./loggers.js');
+    logStartupStats = loggersModule.logStartupStats as ReturnType<typeof vi.fn>;
+
     // Create a fresh profiler instance
     profiler = StartupProfiler.getInstance();
 
@@ -343,5 +352,28 @@ describe('StartupProfiler', () => {
         expect.objectContaining({ phase: 'complete_phase' }),
       );
     });
+    it('should log startup stats event', () => {
+      const handle = profiler.start('test_phase');
+      handle?.end();
+
+      profiler.flush(mockConfig);
+
+      expect(logStartupStats).toHaveBeenCalledWith(
+        mockConfig,
+        expect.objectContaining({
+          phases: expect.arrayContaining([
+            expect.objectContaining({
+              name: 'test_phase',
+              duration_ms: expect.any(Number),
+              start_time_usec: expect.any(Number),
+              end_time_usec: expect.any(Number),
+            }),
+          ]),
+          os_platform: 'darwin',
+          os_release: '22.6.0',
+          is_docker: false,
+        }),
+      );
+    });
   });
 });