src/vs/platform/remoteTunnel/electron-browser/remoteTunnelService.ts/RemoteTunnelService/_getHostName
class RemoteTunnelService:	private _getHostName(): string | undefined {
		let name = this.configurationService.getValue<string>(CONFIGURATION_KEY_HOST_NAME) || hostname();
		name = name.replace(/[^\w-]/g, '').substring(0, 20);
		return name || undefined;
	}