We've got data in Victoria Logs!

It was my syslog-ng config, which now has this bit appended to a stock config file:

destination d_victorialogs {
network("logs.int.unixathome.org" port(29514) transport("tcp"));
};

# Log path linking your sources to VictoriaLogs
log {
source(src); # Use your existing system source name here
destination(d_victorialogs);
};