question: @ Override protected ArrayList < String > genAttachFiles ( ) { _log . info ( "Start SendHeartbeatEvent::genAttachFiles" ) ; ArrayList < String > fileList = new ArrayList < String > ( ) ; try { fileList . add ( generateConfigFile ( ) ) ; } catch ( Exception e ) { _log . error ( "Error occurred while creating config file. {}" , e ) ; } _log . info ( "End SendHeartbeatEvent::genAttachFiles" ) ; return fileList ; }
target:  Generate the attached file list.