# Historical Documents

This part of the documentation set contains historical documents which are still of interest or may be useful in some more exotic environments.

- Using php-syslog-ng with rsyslog
- Legacy Format Samples for Multiple Rulesets
- Developing rsyslog modules (outdated)
- Receiving massive amounts of messages with high performance
- Compatibility Notes for rsyslog v8
- Compatibility Notes for rsyslog v7
- Compatibility Notes for rsyslog v6
- Compatibility Notes for rsyslog v5
- Compatibility Notes for rsyslog v4
- Compatibility Notes for rsyslog v3

Support: rsyslog Assistant | GitHub Discussions | GitHub Issues: rsyslog source project

Contributing: Source & docs: rsyslog source project

© 2008–2025 Rainer Gerhards and others. Licensed under the Apache License 2.0.