On netmetr update its configuration is reseted to shipped version
This resets netmetr measurements sync code and results to lost access to data from user.
Fix is simple, file /etc/config/netmetr wasn't set as config file.
Fixed in: https://gitlab.labs.nic.cz/turris/turris-os-packages/commit/c06d30c11fd05403078a0a6716517d862ab493df
Workaround: User should save its sync_code and after update should restore it.