Ever since I updated the BPi recently, the ramlogger stopped working. I'm regularly getting mail from the Cron Daemon saying this:
/usr/lib/armbian/armbian-truncate-logs: 19: /usr/lib/armbian/armbian-truncate-logs: logrotate: not found
… so, it looks like the paths are messed up since the program is definitely installed in `/usr/sbin/`.