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The box divided used by the whole filesystem, so the 5 % reserved for root made a full disk read ~5 points low (61.8 of 68.7 GB = 90 % where df said 95 %) and the fill alarms fire late. One function, DFUsedPercent, now serves GetDiskUsage, readDiskUsage, the recovery-unit headroom projection and the deploy page's free percent. Tests use numbers measured on demo-hp 9201 (/mnt/sys_drive: old 21.5 %, df 23 %); a source scan refuses a percent divided by the whole filesystem (red-proved by putting the old line back). The label measured the docker data volume, not /. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS