Export borg information to prometheus.
Copy borg_exporter.sh to /usr/local/bin.
Copy borg.env to /etc/borg and replace your repokey and repository in it.
Copy the systemd unit to /etc/systemd/system and run
systemctl enable prometheus-borg-exporter.timer
systemctl start prometheus-borg-exporter.timer
Alternative: Use ExecStartPost in your borg backupt timer itself to write our the metrics.
borg_extract_exit_code
borg_hours_from_last_backup
borg_archives_count
borg_files_count
borg_chunks_unique
borg_chunks_total
borg_last_size
borg_last_size_compressed
borg_last_size_dedup
borg_total_size
borg_total_size_compressed
borg_total_size_dedup
See here for a sample grafana dashboard.