src/vs/workbench/contrib/extensions/browser/extensionRecommendationsService.ts/ExtensionRecommendationsService/onDidInstallExtensions
class ExtensionRecommendationsService:	private onDidInstallExtensions(results: readonly InstallExtensionResult[]): void {
		for (const e of results) {
			if (e.source && !URI.isUri(e.source) && e.operation === InstallOperation.Install) {
				const extRecommendations = this.getAllRecommendationsWithReason() || {};
				const recommendationReason = extRecommendations[e.source.identifier.id.toLowerCase()];
				if (recommendationReason) {
					/* __GDPR__
						"extensionGallery:install:recommendations" : {
							"owner": "sandy081",
							"recommendationReason": { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true },
							"${include}": [
								"${GalleryExtensionTelemetryData}"
							]
						}
					*/
					this.telemetryService.publicLog('extensionGallery:install:recommendations', { ...e.source.telemetryData, recommendationReason: recommendationReason.reasonId });
				}
			}
		}
	}