feat(webui): show PSU load as a fill on the topology PSU card

Same idea as the fan duty-cycle fill: a bar rising from the bottom of
each PSU card for draw / nameplate rating, live-updated on the shared
5s /api/metrics/latest poll. Drawn only when the rating (wattage_w) is
known — a raw wattage with nothing to scale against is not a load
figure, so BMCs that report only input power (e.g. this MSI stand) keep
showing the plain watts. Detail line becomes "<v> V · <draw> / <rating> W
· <n>% load" when both are present.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_019VHG21rgTUiR1G3qFHTVmN

audit/internal/webui/page_topo_diagram.go

@@ -628,19 +628,30 @@ func renderTopoPSURow(psus []schema.HardwarePowerSupply) string {
 	b.WriteString(`<div style="display:flex;flex-wrap:wrap;gap:8px">`)
 	for i, p := range psus {
 		sev := classifyTopoSeverity(p.Status)
-		fill, stroke, text := topoSeverityColors(sev)
+		_, stroke, text := topoSeverityColors(sev)
 
 		label := fmt.Sprintf("PSU %d", i)
 		if p.Slot != nil && strings.TrimSpace(*p.Slot) != "" {
 			label = strings.TrimSpace(*p.Slot)
 		}
 
+		draw, haveDraw := psuDrawW(p)
+		rating := 0
+		if p.WattageW != nil && *p.WattageW > 0 {
+			rating = *p.WattageW
+		}
+
 		var parts []string
 		if p.InputVoltage != nil && *p.InputVoltage > 0 {
 			parts = append(parts, fmt.Sprintf("%.0f V", *p.InputVoltage))
 		}
-		if w := psuWatts(p); w != "" {
+		switch {
-			parts = append(parts, w)
+		case haveDraw && rating > 0:
+			parts = append(parts, fmt.Sprintf("%.0f / %d W · %.0f%% load", draw, rating, draw/float64(rating)*100))
+		case haveDraw:
+			parts = append(parts, fmt.Sprintf("%.0f W", draw))
+		case rating > 0:
+			parts = append(parts, fmt.Sprintf("%d W rated", rating))
 		}
 		detail := strings.Join(parts, " · ")
 
@@ -649,34 +660,55 @@ func renderTopoPSURow(psus []schema.HardwarePowerSupply) string {
 			statusWord = topoSeverityStatus(p.Status)
 		}
 
-		fmt.Fprintf(&b, `<div class="topo-psu-tile" data-psu="%d" onclick="openComponentDetail('psu')" `+
+		// Load fill (draw / rating) rises from the bottom of the card, the
-			`style="cursor:pointer;min-width:96px;padding:8px 11px;border-radius:6px;background:%s;border:1px solid %s;color:%s">`+
+		// same idea as the fan duty-cycle fill. Only drawn when the nameplate
-			`<div style="font-size:13px;font-weight:700">%s</div>`,
+		// rating is known — a raw wattage with nothing to scale it against is
-			i, fill, stroke, text, html.EscapeString(label))
+		// not a load figure.
-		if detail != "" {
+		loadPct := -1.0
-			fmt.Fprintf(&b, `<div class="topo-psu-detail" style="font-size:11px;opacity:.85;margin-top:2px">%s</div>`, html.EscapeString(detail))
+		if haveDraw && rating > 0 {
+			loadPct = draw / float64(rating) * 100
+			if loadPct < 0 {
+				loadPct = 0
 			}
+			if loadPct > 100 {
+				loadPct = 100
+			}
+		}
+		fillH := 0.0
+		if loadPct >= 0 {
+			fillH = loadPct
+		}
+
+		voltAttr := ""
+		if p.InputVoltage != nil && *p.InputVoltage > 0 {
+			voltAttr = fmt.Sprintf("%.0f", *p.InputVoltage)
+		}
+
+		fmt.Fprintf(&b, `<div class="topo-psu-tile" data-psu="%d" data-psu-max="%d" data-psu-v="%s" onclick="openComponentDetail('psu')" `+
+			`style="position:relative;overflow:hidden;cursor:pointer;min-width:104px;padding:8px 11px;border-radius:6px;background:var(--surface-2);border:1px solid %s;color:%s">`,
+			i, rating, voltAttr, stroke, text)
+		fmt.Fprintf(&b, `<div class="topo-psu-fill" style="position:absolute;left:0;right:0;bottom:0;height:%.0f%%;background:%s;opacity:.5;transition:height .8s linear"></div>`, fillH, stroke)
+		fmt.Fprintf(&b, `<div style="position:relative"><div style="font-size:13px;font-weight:700">%s</div>`, html.EscapeString(label))
+		fmt.Fprintf(&b, `<div class="topo-psu-detail" style="font-size:11px;opacity:.9;margin-top:2px">%s</div>`, html.EscapeString(detail))
 		if statusWord != "" {
 			fmt.Fprintf(&b, `<div style="font-size:10px;font-weight:700;margin-top:3px">%s</div>`, html.EscapeString(strings.ToUpper(statusWord)))
 		}
-		b.WriteString(`</div>`)
+		b.WriteString(`</div></div>`)
 	}
 	b.WriteString(`</div>`)
 	return b.String()
 }
 
-// psuWatts picks the most meaningful power figure for a PSU card: measured
+// psuDrawW returns the PSU's current power draw (measured output preferred,
-// output, else measured input, else the nameplate rating.
+// else measured input).
-func psuWatts(p schema.HardwarePowerSupply) string {
+func psuDrawW(p schema.HardwarePowerSupply) (float64, bool) {
 	switch {
 	case p.OutputPowerW != nil && *p.OutputPowerW > 0:
-		return fmt.Sprintf("%.0f W", *p.OutputPowerW)
+		return *p.OutputPowerW, true
 	case p.InputPowerW != nil && *p.InputPowerW > 0:
-		return fmt.Sprintf("%.0f W", *p.InputPowerW)
+		return *p.InputPowerW, true
-	case p.WattageW != nil && *p.WattageW > 0:
-		return fmt.Sprintf("%d W rated", *p.WattageW)
 	default:
-		return ""
+		return 0, false
 	}
 }
 
@@ -794,9 +826,15 @@ func topoLiveScript() string {
       }
       if(m.psus){
         psus.forEach(function(t){
-          var p=m.psus[parseInt(t.dataset.psu,10)];if(!p||!(p.power_w>0))return;
+          var p=m.psus[parseInt(t.dataset.psu,10)];if(!p)return;
-          var d=t.querySelector('.topo-psu-detail');if(!d)return;
+          var w=p.power_w||0,max=parseFloat(t.dataset.psuMax)||0,v=t.dataset.psuV;
-          d.textContent=d.textContent.replace(/[\d.]+ W(?: rated)?/, Math.round(p.power_w)+' W');
+          var parts=[];
+          if(v)parts.push(v+' V');
+          if(w>0&&max>0)parts.push(Math.round(w)+' / '+max+' W · '+Math.round(w/max*100)+'% load');
+          else if(w>0)parts.push(Math.round(w)+' W');
+          else if(max>0)parts.push(max+' W rated');
+          var d=t.querySelector('.topo-psu-detail');if(d&&parts.length)d.textContent=parts.join(' · ');
+          if(w>0&&max>0){var f=t.querySelector('.topo-psu-fill');if(f)f.style.height=Math.max(0,Math.min(100,w/max*100)).toFixed(0)+'%';}
         });
       }
     }).catch(function(){});

audit/internal/webui/page_topo_test.go

@@ -93,6 +93,7 @@ func TestTopoPageRendersArbitraryPSUAndFirmwareCountsAsFlexRows(t *testing.T) {
 	failStatus := "Critical"
 	watt := 3000
 	volt := 230.0
+	draw := 1500.0
 
 	var psus []schema.HardwarePowerSupply
 	for i := 0; i < 6; i++ {
@@ -101,11 +102,13 @@ func TestTopoPageRendersArbitraryPSUAndFirmwareCountsAsFlexRows(t *testing.T) {
 		if i == 3 {
 			st = failStatus
 		}
+		d := draw
 		psus = append(psus, schema.HardwarePowerSupply{
 			HardwareComponentStatus: schema.HardwareComponentStatus{Status: &st},
 			Slot:                    &slot,
 			WattageW:                &watt,
 			InputVoltage:            &volt,
+			InputPowerW:             &d,
 		})
 	}
 
@@ -147,8 +150,12 @@ func TestTopoPageRendersArbitraryPSUAndFirmwareCountsAsFlexRows(t *testing.T) {
 		strings.Count(body, `onclick="openComponentDetail(&#39;psu&#39;)"`); n != 6 {
 		t.Fatalf("expected one clickable card per PSU (6), got %d", n)
 	}
-	if !strings.Contains(body, "230 V · 3000 W rated") {
+	if !strings.Contains(body, "230 V · 1500 / 3000 W · 50% load") {
-		t.Fatalf("PSU card missing voltage/power line: %s", body)
+		t.Fatalf("PSU card missing voltage / draw / load line: %s", body)
+	}
+	// Load fill (draw/rating) is drawn, same idea as the fan duty fill.
+	if !strings.Contains(body, `class="topo-psu-fill"`) || !strings.Contains(body, "height:50%") {
+		t.Fatalf("PSU card missing load fill: %s", body)
 	}
 	// The one failed PSU is coloured red on its own (crit token) and labelled.
 	if !strings.Contains(body, "var(--crit-bg)") || !strings.Contains(body, "CRITICAL") {