I just tried that. If I run the logwatch script with -d it basically outputs the whole log, so I get something like this:
./mk_logwatch -d
<<<logwatch>>>
[[[/var/log/svnserve.log]]]
. 16827 2018-07-13T12:37:38.729019Z 217.23.13.201 louis Digio checkout-or-export / r164
C 21678 2018-07-14T05:49:39.098216Z 122.228.10.50 - - ERR - 0 210004 Malformed network data
. 21919 2018-07-14T06:59:18.412844Z 217.23.13.201 louis Digio get-latest-rev
. 21919 2018-07-14T06:59:18.451383Z 217.23.13.201 louis Digio reparent /
. 21919 2018-07-14T06:59:18.565825Z 217.23.13.201 louis Digio update / r164
C 11418 2018-07-22T08:57:02.277026Z 78.128.112.22 - - ERR - 0 210004 Malformed network data
C 16171 2018-07-24T15:41:28.443567Z 122.228.10.50 - - ERR - 0 210004 Malformed network data
In the output of the agent however, it’s still the same:
/usr/bin/check_mk_agent -d
…
<<<logwatch>>>
[[[/var/log/svnserve.log]]]