You have found the PE documentation but I have already ported this to the OSE tree and has been released as part of 3.4.
You have to specify indented-multi-line as a flag to the file source.
We have tomcat shop and at everyone know tomcat has a java call trace in logs with tab space but syslog-ng doesn't know about it and printing lines as a new line. I have read here syslog-ng 3.x does support multi-line logs http://www.balabit.com/sites/default/files/documents/syslog-ng-pe-4.0-guides/en/syslog-ng-pe-v4.0-guide-admin-en/html/reference_source_syslog.htmlBut does this feature available in Open Source syslog-ng? If yes then why its not working for me?
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