Could you please explain the meaning of FileSize and Lengths in the transmitter log output below ? 

****************transmitter.log 
06:44:09 2018 CAWA_I_20041 Executing /dnb/Prod/heim.bat/jobstart /dnb/Prod/heim.bat/jobstart -j p5207064 -a etl -s sett_omg etl etlbatch.sh kvh_prod P5207064. pid: 8803") FileSize(7595) Lengths(828 57 75 72 78 83 88 127 113 77 79 114 94 70 76 81 100 112 112 101 77 94 72 120 75 88 95 80 80 79 78 80 119 104 86 81 66 86 84 73 87 86 83 547 97 130 74 102 78 77 77 79 83 85 84 82 83 95 87 68 916 179 ) DataStatus(EOF) Plugin(runner) User(XXXXXXX) Host(YYYYYYYY)

Agent version 11.3 SP4

The text is part of a message that is a response to a CONTROL GETSPOOLFILE message from the manager. From AutoSys, that would probably be the response to an "autosyslog -TA" command.
The FileSize parameter is the size of the joblog file in the agent spool directory.
The Lengths are the lengths of each line in the file. The data is sent without line endings, so the Lengths allows AutoSys to add the line endings that are appropriate for the machine requesting the information.