Monitoring debian security updates with Prometheus Textfile collector. Don't forget run node_exporter with appropriate parameters!

prom_updates.cron

# based on https://www.robustperception.io/monitoring-directory-sizes-with-the-textfile-collector/

33 * * * * unattended-upgrade --dry-run -d 2> /dev/null | grep 'Checking' | wc -l | sed -ne 's/^\([0-9]\+\).*$/security_updates_count \1/p' > /var/lib/node_exporter/textfile_collector/security_updates_count.prom.$$ && mv /var/lib/node_exporter/textfile_collector/security_updates_count.prom.$$ /var/lib/node_exporter/textfile_collector/security_updates_count.prom