docs(bf-53q6): note that feature was already complete

notes/bf-53q6.md

@@ -1,53 +1,55 @@
-# Task bf-53q6: System cgroup memory panel for web dashboard
+# System Cgroup Memory Panel - Already Complete
 
-## Status: Feature Already Complete
+## Status
 
-This task requested adding a system cgroup memory panel to the FABRIC web dashboard with:
-- Current cgroup memory usage vs MemoryHigh (progress bar with color coding)
-- 5-minute sparkline of memory.current sampled every 10s
-- oom_kill counter from memory.events
-- Swap usage if enabled
+The system cgroup memory panel feature was already fully implemented in prior commits.
 
 ## Implementation Summary
 
-The feature was already fully implemented in the codebase:
+### Backend (Completed)
+- **API Endpoints** (src/web/server.ts, lines 1619-1664):
+  - `GET /api/system/memory` - Current memory status with formatted values
+  - `GET /api/system/memory/history` - 5-minute history (30 samples @ 10s intervals)
+  - `GET /api/system/memory/summary` - Human-readable summary
+  - `GET /api/alerts/oom` - OOM risk assessment
 
-### Backend (src/systemCgroupMonitor.ts)
-- `getSystemMemoryStatus()` - Reads cgroup memory stats from /sys/fs/cgroup/user.slice/user-1001.slice/
-- `getMemoryHistory()` - Returns 5-minute history (30 samples @ 10s intervals)
-- `startMemorySampler()` - Background sampler (started in server.ts at line 1745)
-- OOM kill parsing from memory.events
-- Swap usage reading from memory.swap.current
+- **Cgroup Monitor** (src/systemCgroupMonitor.ts):
+  - Reads from `/sys/fs/cgroup/user.slice/user-1001.slice/memory.*`
+  - Tracks memory.current, memory.high, memory.max, memory.swap.current
+  - Parses oom_kill counter from memory.events
+  - Maintains 30-sample history for sparkline visualization
+  - Background sampler running at 10s intervals
 
-### API Endpoints (src/web/server.ts)
-- `GET /api/system/memory` - Returns current memory status with formatted values
-- `GET /api/system/memory/history` - Returns memory history for sparkline
-- `GET /api/alerts/oom` - Returns OOM risk alert
+### Frontend (Completed)
+- **SystemMemoryPanel.tsx** (703 lines):
+  - Full-featured panel with real-time memory visualization
+  - 5-minute sparkline with color-coded bars (green/yellow/red)
+  - Progress bar showing cgroup usage vs limit with dynamic coloring
+  - OOM kill counter display
+  - Swap usage section with progress bar
+  - System memory, FABRIC process RSS sections
+  - OOM risk levels legend
 
-### Frontend Components
-1. **SystemMemoryIndicator.tsx** (compact indicator in fleet header)
-   - Progress bar (green <70%, yellow 70-90%, red >90%)
-   - 5-minute sparkline (30 samples)
-   - OOM kill counter (💀 icon)
-   - Swap indicator (🔁 icon)
+- **SystemMemoryIndicator.tsx** (259 lines):
+  - Compact indicator for fleet header
+  - Progress bar with color coding
+  - Mini sparkline (30 samples)
+  - OOM kill counter badge
+  - Swap indicator icon
 
-2. **SystemMemoryPanel.tsx** (full detail panel)
-   - All above features plus:
-   - Detailed memory sections (Cgroup, System, Swap, FABRIC Process)
-   - OOM risk legend
-   - Auto-refresh every 5 seconds
+- **Integration** (App.tsx):
+  - Indicator in fleet-header (line 928)
+  - Panel toggle button in header (lines 871-878)
+  - Full panel rendered when active (lines 1122-1127)
 
-### Integration (src/web/frontend/src/App.tsx)
-- Line 24: Import SystemMemoryIndicator
-- Line 28: Import SystemMemoryPanel
-- Line 928: Indicator in fleet header
-- Lines 1122-1127: Full panel with visibility toggle
-- Lines 872-878: Toggle button in header
+### Requirements Met
+✅ Current cgroup memory usage vs MemoryHigh (progress bar: green <70%, yellow 70-90%, red >90%)
+✅ 5-minute sparkline of memory.current sampled every 10s
+✅ oom_kill counter from memory.events
+✅ Swap usage if enabled
+✅ Backend GET /api/system/memory endpoint
+✅ React component alongside fleet summary bar
 
-## Verification
-
-- All 2511 tests pass
-- Memory sampler runs at 10s intervals (configured in server.ts)
-- UI components properly integrated in the dashboard
-
-No additional work required.
+## Related Commits
+- 83baf06 feat(bf-53q6): integrate SystemMemoryPanel into FABRIC web dashboard
+- 81b57e6 refactor(bf-53q6): add SystemMemoryIndicator to fleet header and clean up cgroup monitor