src/vs/workbench/contrib/extensions/browser/extensionRecommendationsService.ts/ExtensionRecommendationsService/onDidInstallExtension
class ExtensionRecommendationsService:	private onDidInstallExtension(e: DidInstallExtensionEvent): void {
		if (e.gallery && e.operation === InstallOperation.Install) {
			const extRecommendations = this.getAllRecommendationsWithReason() || {};
			const recommendationReason = extRecommendations[e.gallery.identifier.id.toLowerCase()];
			if (recommendationReason) {
				/* __GDPR__
					"extensionGallery:install:recommendations" : {
						"recommendationReason": { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true },
						"${include}": [
							"${GalleryExtensionTelemetryData}"
						]
					}
				*/
				this.telemetryService.publicLog('extensionGallery:install:recommendations', { ...e.gallery.telemetryData, recommendationReason: recommendationReason.reasonId });
			}
		}
	}