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ChuckandClaude Opus 5
4f24e2aa42
System Diagnostics reported memory as used-percent plus used/total GB. Neither distinguishes a healthy board from one about to fail, because page cache counts as used and is reclaimable on demand -- a Pi can read 70% used and be fine, or read the same and be minutes from trouble. MemAvailable is the kernel's own estimate of what a new allocation can actually obtain, and it is the number that tracked the failure on a 1GB Pi 3B+: healthy running sat above 500MB, and the crash came at 73MB. By that point fork() was failing, so sshd could not spawn a session and systemd could not respawn the display, while the kernel carried on answering pings at 0% loss. Used-percent gave no warning at any point on the way there; available memory fell steadily for hours. /api/v3/system/status now returns memory_available_mb from psutil.virtual_memory().available, and Tools renders it as its own tile, coloured against the thresholds that failure implies: red under 150MB, amber under 300MB, green above. The existing memory tile is left alone -- used/total is still what you want when sizing a workload; this answers the different question of how much room is left right now. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>