APC-52 - trckr

← APC-52

Created: 2026-01-20 • Updated: 2026-01-20

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Add an 'Unallocated' section to the power breakdown chart that shows the difference between the PDU's total reported power and the sum of all measured outlet/device power.

**Background:**
- The PDU reports total phase power via SNMP (accurate hardware measurement)
- Individual outlet current readings are only reported if >= 0.1A (PDU limitation)
- Devices drawing < 0.1A show as 0W in the breakdown but still contribute to total power
- This creates a discrepancy between the sum of shown devices/outlets and the actual total

**Requirements:**
1. Calculate: `unallocated_power = total_phase_power - sum(all_outlet_powers)`
2. Add an 'Unallocated' entry to the power breakdown chart
3. Show this as a distinct color (e.g., dotted pattern or lighter shade)
4. Tooltip should explain: 'Power from devices drawing < 0.1A (below measurement threshold)'

**Implementation Notes:**
- The total phase power comes from `/api/power/summary` -> `total_power_watts`
- The sum of device + unassigned outlet power can be calculated from the existing data
- The difference represents unmeasured/unallocated power

**Files to modify:**
- `frontend/src/components/power-breakdown-chart.tsx` - add unallocated calculation and chart entry

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Comments (2)

qa-agent · 2026-01-20

## QA PASSED See QA report document: 995a34ec-ded6-450a-b313-9ea46d329b08 ### Summary The 'Unallocated' power breakdown feature has been verified through code review and partial functional testing. ### Verification Results - **Code Implementation:** All 7 required changes correctly implemented - **Calculation Logic:** Correctly computes unallocated = total_power - measured_power - **Threshold:** Only shows when unallocated > 0.5W (avoids floating point noise) - **Styling:** Distinct color (#9ca3af) with 70% opacity - **Tooltip:** Displays 'Power from devices drawing <0.1A (below measurement threshold)' - **Chart Views:** Works in both bar and pie chart ### Tests Pass - Login: PASS - History page access: PASS - Power Breakdown chart renders: PASS - Code review confirms correct implementation: PASS All hypotheses tested. Fix verified working.

agent · 2026-01-20

## Implementation Complete ### Problem The PDU reports total phase power accurately, but individual outlets only report current if >= 0.1A. Devices drawing less than 0.1A show as 0W but still contribute to total power. This creates a discrepancy between the sum of device/outlet power and the total. ### Changes Made Modified `frontend/src/components/power-breakdown-chart.tsx`: 1. **Added `isUnallocated` flag to `PowerDataItem` interface** (line 35) - New optional boolean to identify unallocated power entries 2. **Added `UNALLOCATED_COLOR` constant** (line 60) - Lighter gray (#9ca3af) to distinguish from unassigned outlets 3. **Updated `CustomBarTooltip` function** (lines 74-77) - Added tooltip text: "Power from devices drawing <0.1A (below measurement threshold)" 4. **Updated `CustomPieTooltip` function** (lines 115-118) - Same tooltip text for pie chart view 5. **Added unallocated power calculation in `fetchData`** (lines 214-232) - Calculates sum of all measured power (devices + unassigned outlets) - Computes: `unallocatedPower = total_power_watts - measuredPower` - Only adds entry if unallocated > 0.5W (to avoid floating point noise) - Entry appears at end of list (after sort, not re-sorted) 6. **Updated Cell rendering for both charts** (lines 368-376, 401-409) - Uses UNALLOCATED_COLOR for unallocated entries - Applies 70% opacity for visual distinction ### Verification - All 111 tests pass (`npm test`) - Build succeeds (`npm run build`) ### How It Works When the chart loads, it: 1. Fetches total power from the PDU (accurate hardware measurement) 2. Sums up all device power and unassigned outlet power (only outlets >= 0.1A are measured) 3. Calculates the difference as "Unallocated" power 4. Displays this with a lighter gray color and reduced opacity 5. Tooltip explains this represents power below the 0.1A measurement threshold