/lib/udev/rules.d/99-rax.rules is in rax-nova-agent 2.1.13-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | # Give syslog write access to the kernel logs
KERNEL=="console", GROUP="syslog", MODE="0620"
|