For my own curiosity, I decided to check the release notes. I thought it was weird that TrueNAS would remove SMART monitoring, but looks like they didn’t. Just got heavily changed what they’re doing with it. The new recommendation is to use a third-party tool which does what TrueNAS was doing with disk monitoring, but does it better.

The short of it is TrueNAS still has smartmontools binaries installed and still monitors SMART data from drives. Just doesn’t have the dedicated space in the UI anymore. It’ll still alert on SMART failures.

Link to Disk Monitoring in the relevant Release Notes (25.10):

https://www.truenas.com/docs/scale/25.10/gettingstarted/versionnotes/#smart-monitoring-and-disk-management-in-2510-and-beyond