src/vs/workbench/contrib/preferences/browser/preferencesEditor.ts/PreferencesRenderersController/_updatePreference
class PreferencesRenderersController:	private _updatePreference(key: string, value: any, source: ISetting, fromEditableSettings?: boolean): void {
		const data: { [key: string]: any; } = {
			userConfigurationKeys: [key]
		};

		if (this.lastFilterResult) {
			data['editableSide'] = !!fromEditableSettings;

			const nlpMetadata = this.lastFilterResult.metadata && this.lastFilterResult.metadata['nlpResult'];
			if (nlpMetadata) {
				const sortedKeys = Object.keys(nlpMetadata.scoredResults).sort((a, b) => nlpMetadata.scoredResults[b].score - nlpMetadata.scoredResults[a].score);
				const suffix = '##' + key;
				data['nlpIndex'] = sortedKeys.findIndex(key => key.endsWith(suffix));
			}

			const settingLocation = this._findSetting(this.lastFilterResult, key);
			if (settingLocation) {
				data['groupId'] = this.lastFilterResult.filteredGroups[settingLocation.groupIdx].id;
				data['displayIdx'] = settingLocation.overallSettingIdx;
			}
		}

		/* __GDPR__
			"defaultSettingsActions.copySetting" : {
				"userConfigurationKeys" : { "classification": "SystemMetaData", "purpose": "FeatureInsight" },
				"nlpIndex" : { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true },
				"groupId" : { "classification": "SystemMetaData", "purpose": "FeatureInsight" },
				"displayIdx" : { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true },
				"editableSide" : { "classification": "SystemMetaData", "purpose": "FeatureInsight", "isMeasurement": true }
			}
		*/
		this.telemetryService.publicLog('defaultSettingsActions.copySetting', data);
	}