I've been running ZFS for around 20 years and am very comfortable with it. My current server is Ubuntu 22.04.5.

Last night I was bored logging into my different boxes and looking around. I ran df on my main server and saw that 56 of my 61 snapshots were mounted. The script that creates and manages my snaps has not changed in at least 3 years, there's nothing weird in any logs and I'm confused. I can manually unmount them and everything looks fine.

The only thing I can think of that's changed recently is I installed Prometheus node_exporter and I just checked and the zfs collector is enabled by default. I'm wondering if that mounted them so it could collect their details..

Any other thoughts?