[syslog-ng] How to roll journald cursor in persist file

[Matwey V. Kornilov]

Hello,

I am running syslog-ng 3.7.1 and journald v210. The goal I want to reach 
is the following.
I would like to replicate local system logs to remote endpoint using 
standard UDP protocol.

So, I've just disabled all destinations except the following one:

destination logserver { udp("10.0.0.47" port(514)); };
log { source(src); destination(logserver); };

The issue is the following. It seems that syslog-ng 3.7.1 uses journald 
natively for system() source. And I like it. The issue is that when I 
start syslog-ng it tries to sync all existing local journald data (about 
5 GB of compressed journald data, 1.5 years of logs) from the beginning.

I found in modules/systemd-journal/journal-reader.c that syslog-ng 
stores journald cursor in the persists file. I would like to point the 
cursor to the end of journald database in order to avoid unneeded log sync.

The question is how could I do that in opensource syslog-ng version?