Fix fan chart gaps and task durations

audit/internal/webui/api.go

@@ -746,13 +746,7 @@ func (h *handler) feedRings(sample platform.LiveMetricSample) {
 	h.ringMemLoad.push(sample.MemLoadPct)
 
 	h.ringsMu.Lock()
-	for i, fan := range sample.Fans {
-		for len(h.ringFans) <= i {
-			h.ringFans = append(h.ringFans, newMetricsRing(120))
-			h.fanNames = append(h.fanNames, fan.Name)
-		}
-		h.ringFans[i].push(float64(fan.RPM))
-	}
+	h.pushFanRings(sample.Fans)
 	for _, gpu := range sample.GPUs {
 		idx := gpu.GPUIndex
 		for len(h.gpuRings) <= idx {
@@ -771,6 +765,51 @@ func (h *handler) feedRings(sample platform.LiveMetricSample) {
 	h.ringsMu.Unlock()
 }
 
+func (h *handler) pushFanRings(fans []platform.FanReading) {
+	if len(fans) == 0 && len(h.ringFans) == 0 {
+		return
+	}
+	fanValues := make(map[string]float64, len(fans))
+	for _, fan := range fans {
+		if fan.Name == "" {
+			continue
+		}
+		fanValues[fan.Name] = fan.RPM
+		found := false
+		for i, name := range h.fanNames {
+			if name == fan.Name {
+				found = true
+				if i >= len(h.ringFans) {
+					h.ringFans = append(h.ringFans, newMetricsRing(120))
+				}
+				break
+			}
+		}
+		if !found {
+			h.fanNames = append(h.fanNames, fan.Name)
+			h.ringFans = append(h.ringFans, newMetricsRing(120))
+		}
+	}
+	for i, ring := range h.ringFans {
+		if ring == nil {
+			continue
+		}
+		name := ""
+		if i < len(h.fanNames) {
+			name = h.fanNames[i]
+		}
+		if rpm, ok := fanValues[name]; ok {
+			ring.push(rpm)
+			continue
+		}
+		if last, ok := ring.latest(); ok {
+			ring.push(last)
+			continue
+		}
+		ring.push(0)
+	}
+}
+
 func (h *handler) pushNamedMetricRing(dst *[]*namedMetricsRing, name string, value float64) {
 	if name == "" {
 		return