Prometheus textfile collector for ZFS snapshot statistics, exposing:

• zfs_snapshots_total: Number of snapshots per filesystem.
• zfs_snapshots_oldest_seconds: Age of oldest snapshot (per filesystem) since unix epoch in seconds.
• zfs_snapshots_latest_seconds: Age of latest snapshot (per filesystem) since unix epoch in seconds.
• zfs_snapshots_time_spent_getting_snapshots_seconds: Time spent waiting for zfs list to return snapshots.
• zfs_snapshots_last_update_timestamp_seconds: Time of last update in seconds since unix epoch.

Ubuntu/Debian users can run ./package.sh to build a Debian package to install. The included systemd service files will run this approximately every 15 seconds by default.

Requires Python 3.6+ and assumes node_exporter is running and configured with --collector.textfile.directory /var/tmp/node-exporter.

The first argument to the script determines the filesystem root to scan and defaults to storage. To adjust, run systemctl edit zfs-snapshots-collector.service and add:

[Service]
ExecStart=
ExecStart=/usr/bin/zfs-snapshots-collector YOUR_FILESYSTEM_ROOT