src/vs/platform/telemetry/node/appInsightsAppender.ts/AppInsightsAppender/log
class AppInsightsAppender:	log(eventName: string, data?: any): void {
		if (!this._aiClient) {
			return;
		}
		data = mixin(data, this._defaultData);
		data = validateTelemetryData(data);

		this._withAIClient((aiClient) => aiClient.trackEvent({
			name: this._eventPrefix + '/' + eventName,
			properties: data.properties,
			measurements: data.measurements
		}));
	}