feat(web): show available memory in Tools diagnostics - #500
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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>
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe system status API now reports available memory from ChangesAvailable memory diagnostics
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This localized change adds an available-memory diagnostic field and tile without changing existing memory fields; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant Diagnostics
participant api_v3
participant psutil
Diagnostics->>api_v3: Request /api/v3/system/status
api_v3->>psutil: Read virtual_memory().available
psutil-->>api_v3: Return available bytes
api_v3-->>Diagnostics: Return memory_available_mb
Diagnostics->>Diagnostics: Round value and apply threshold color
🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Inline comments:
In `@web_interface/templates/v3/partials/tools.html`:
- Around line 696-709: Update the available-memory handling in the diagnostic
tile construction so the value used by availColor and the displayed value share
the same rounding behavior; preserve the existing null handling and threshold
colors.
Apply the same fix in `@web_interface/templates/v3/partials/tools.html` around
lines 696 - 700.
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test/test_system_status_available_memory.pyweb_interface/blueprints/api_v3.pyweb_interface/templates/v3/partials/tools.html
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The colour was classified from the raw value while the label was rounded,
and the API sends one decimal place. At the boundaries the two disagreed:
149.6 rendered as "150 MB" in red, and 299.6 as "300 MB" in amber -- each
contradicting the threshold its own colour claims to apply ("red under
150MB"). A reader checking the tile against the documented thresholds would
conclude the readout was broken.
Rounding once and using that number for both restores agreement. It moves
those two boundary cases up a band, which does not matter: the thresholds
come from a measured failure at 73MB, so which side of the line a spare
0.4MB falls on carries no information. The tile agreeing with itself does.
Null handling and the thresholds themselves are unchanged.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01STMbQE4YctTacQXfbYqKuW
1 participant
Summary
Adds an Available Memory tile to Tools → System Diagnostics, and exposes
memory_available_mbfrom/api/v3/system/status.Why used-percent isn't enough
The panel reports 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 perfectly
fine, or read the same and be minutes from trouble.
MemAvailableis the kernel's own estimate of what a new allocation canactually obtain. On a 1GB Pi 3B+ it tracked the failure precisely:
and on an earlier run, the moment of death:
Below roughly 100MB the board stops failing cleanly:
fork()returns ENOMEM,so
sshdaccepts connections and closes them before its banner, systemd cannotrespawn the display, and the panel goes dark — while the kernel keeps answering
pings at 0% loss. It looks like a hardware fault.
Used-percent gave no useful warning on the way there. Available memory fell
steadily for hours.
Changes
API —
memory_available_mbfrompsutil.virtual_memory().available(
MemAvailableon Linux). Additive; no existing field changes.UI — its own tile, coloured against the thresholds that failure implies:
The existing memory tile is deliberately 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.
Testing
test/test_system_status_available_memory.py— 4 tests, including the case thereadout exists for: a board where 600MB is "not used" but only 300MB can
actually be allocated, so used-percent would call it healthy.
Verified as a real regression test. Against the unpatched endpoint:
The one that passes either way is
test_existing_memory_fields_are_unchanged,which pins the fields this must not disturb.
The threshold logic is verified too, by extracting the
availColorexpressionout of the shipped template and evaluating it — so the test exercises the
committed code rather than a retyped copy:
Full suite diffed against
main: no new failures.Not verified
The tile has not been rendered in a browser — the board I'd normally check
on is currently unreachable. The API field and the colour logic are both tested,
but the visual result (tile placement in the grid, icon choice) is unconfirmed.
Worth a glance before merging.
Summary by CodeRabbit
New Features
Tests