Summary
From Slack @yzguy
seemingly the config for it gets pushed into frr.conf from https://github.com/vyos/vyos-1x/blob/current/src/etc/systemd/system/frr.service.d/override.conf#L6-L11
The log entry is added on restart - but not during normal operation of frrender.py
Logging should be added persistent here https://github.com/vyos/vyos-1x/blob/c984fe04a3ce46c266e0b1854af906d5b317f397/python/vyos/frrender.py#L699