The memory warning used plain system-wide 'free' RAM (via free -g), a
carryover from before this script was ZFS-specific. ZFS ARC deliberately
consumes most otherwise-unused RAM, so 'free' being low is normal and not
a meaningful signal — it fired a false alarm on 2026-07-05 (free 5.8Gi,
but available a healthy 45Gi).
Replaced ZFS_REPORT_FREE_WARN_GB with ZFS_REPORT_ARC_FREE_WARN_GB: warns
when ARC headroom (ARC_MAX - ARC_CURRENT) drops below threshold, which is
what actually indicates ARC is running out of room to grow. Available RAM
check is unchanged — it's a legitimate system-pressure signal on its own.
Gmer4Lfe
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