Sending Subversion logs to Logstash

I see at least one convenient option: 1) Feed you SVN logs to syslog, most distributions use rsyslog now, so here is example for rsyslog (5.x) :

$InputFileName /${path_to}/svn.log
$InputFileTag svn:
$InputFileStateFile /var/spool/rsyslog/svn_log

$InputFileSeverity notice
$InputFileFacility local7
$InputRunFileMonitor

:syslogtag, isequal, "svn:" @@${IP_of_logstash}:$PORT
&~

Please note, that config will different for newer versions of rsyslog. version 8.x config:

#reading SVN logs
input(type="imfile" File="/var/log/${path_to}/svn.log"
Tag="svn:"
StateFile="/var/spool/rsyslog/svn_log"
Severity="normal"
Facility="local7")

:syslogtag, isequal, "svn:" @@${IP_of_logstash}:$PORT
&~

2) Configure logstash syslog listener and parser for logs

In this case logs will not be stored additionally in syslog, but forwarded directly to logstash and syslog transport will take care of it.