Current state verified on 2026-09-24: hyperborea NVMe already exported
via the Debian nvme textfile; no SMART on the NixOS hosts; no
disk-health alert rules. Plan: smartctl_exporter module for the NixOS
hosts, smartmon timer and SD-card kernel-error textfile on hyperborea,
orion scrape job, a disk-health rule group, verification and deploy
notes. For hand-off to another agent.
Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>