From https://github.com/pavel-odintsov/fastnetmon/releases/tag/v1.1.7
The version we're running is working fine, but 1.1.6 brings interesting features (mostly GoBGP, API and CLI).
EDIT: 1.1.7 brings improvements of the IPFIX processing.
I don't know yet the steps needed to package it for our infra
Edit: upstream provides binary packages, so the upgrade should be very easy: https://community-downloads.fastnetmon.com/releases/1.1.7/debian/10/