src/vs/platform/userDataSync/common/globalStateSync.ts/GlobalStateSynchroniser/getStorageKeys
class GlobalStateSynchroniser:	private getStorageKeys(lastSyncGlobalState: IGlobalState | null): StorageKeys {
		const user = this.storageService.keys(StorageScope.PROFILE, StorageTarget.USER);
		const machine = this.storageService.keys(StorageScope.PROFILE, StorageTarget.MACHINE);
		const registered = [...user, ...machine];
		const unregistered = lastSyncGlobalState?.storage ? Object.keys(lastSyncGlobalState.storage).filter(key => !key.startsWith(argvStoragePrefx) && !registered.includes(key) && this.storageService.get(key, StorageScope.PROFILE) !== undefined) : [];

		if (!isWeb) {
			// Following keys are synced only in web. Do not sync these keys in other platforms
			const keysSyncedOnlyInWeb = [...ALL_SYNC_RESOURCES.map(resource => getEnablementKey(resource)), SYNC_SERVICE_URL_TYPE];
			unregistered.push(...keysSyncedOnlyInWeb);
			machine.push(...keysSyncedOnlyInWeb);
		}

		return { user, machine, unregistered };
	}