syslog-ng 3.17.1[1] packages are available in OBS repo[2].

List of supported OSs:

* Debian 8.0

* Debian 9.0

* Ubuntu 14.04

* Ubuntu 16.04

* Ubuntu 16.10

* Ubuntu 17.04

* Ubuntu 17.10

* Ubuntu 18.04

In case of Debian 9.0, armv7l architecture also supported, so you can install it to your Raspberry Pi.

Install

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example: Debian 9.0

1. get release key

wget -qO - http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/Debian_9.0/Release.key | sudo apt-key add -

2. add repo to APT sources

eg.: /etc/apt/sources.list.d/syslog-ng-obs.list

deb http://download.opensuse.org/repositories/home:/laszlo_budai:/syslog-ng/Debian_9.0 ./

Then `apt-get update` and `apt-get install syslog-ng-core`

Links

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[1] https://github.com/balabit/syslog-ng/releases/tag/syslog-ng-3.17.1

[2] https://build.opensuse.org/package/show/home:laszlo_budai:syslog-ng/syslog-ng-3.17

regards,