src/vs/workbench/services/timer/browser/timerService.ts/AbstractTimerService/startupMetrics
class AbstractTimerService:	get startupMetrics(): IStartupMetrics {
		if (!this._startupMetrics) {
			throw new Error('illegal state, MUST NOT access startupMetrics before whenReady has resolved');
		}
		return this._startupMetrics;
	}