fix(metrics): strip units from GPU legend names; fix fan SDR parsing for new IPMI format

Legend names were "GPU 0 %" — remove unit suffix since chart title already
conveys it. Fan parsing now handles the 5-field IPMI SDR format where the
value+unit ("4340 RPM") are combined in the last column rather than split
across separate fields.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

audit/internal/platform/sat_fan_stress.go

@@ -322,7 +322,9 @@ func sampleFanSpeeds() ([]FanReading, error) {
 }
 
 // parseFanSpeeds parses "ipmitool sdr type Fan" output.
-// Line format: "FAN1             | 2400.000   | RPM        | ok"
+// Handles two formats:
+//   Old: "FAN1 | 2400.000 | RPM | ok"           (value in col[1], unit in col[2])
+//   New: "FAN1 | 41h | ok | 29.1 | 4340 RPM"   (value+unit combined in last col)
 func parseFanSpeeds(raw string) []FanReading {
 	var fans []FanReading
 	for _, line := range strings.Split(strings.TrimSpace(raw), "\n") {
@@ -330,25 +332,39 @@ func parseFanSpeeds(raw string) []FanReading {
 		if len(parts) < 2 {
 			continue
 		}
-		unit := ""
+		name := strings.TrimSpace(parts[0])
-		if len(parts) >= 3 {
+		// Find the first field that contains "RPM" (either as a standalone unit or inline)
-			unit = strings.TrimSpace(parts[2])
+		rpmVal := 0.0
+		found := false
+		for _, p := range parts[1:] {
+			p = strings.TrimSpace(p)
+			if !strings.Contains(strings.ToUpper(p), "RPM") {
+				continue
+			}
+			if strings.EqualFold(p, "RPM") {
+				continue // unit-only column in old format; value is in previous field
+			}
+			val, err := parseFanRPMValue(p)
+			if err == nil {
+				rpmVal = val
+				found = true
+				break
+			}
 		}
-		valStr := strings.TrimSpace(parts[1])
+		// Old format: unit "RPM" is in col[2], value is in col[1]
-		if !strings.EqualFold(unit, "RPM") && !strings.Contains(strings.ToUpper(valStr), "RPM") {
+		if !found && len(parts) >= 3 && strings.EqualFold(strings.TrimSpace(parts[2]), "RPM") {
+			valStr := strings.TrimSpace(parts[1])
+			if !strings.EqualFold(valStr, "na") && !strings.EqualFold(valStr, "disabled") && valStr != "" {
+				if val, err := parseFanRPMValue(valStr); err == nil {
+					rpmVal = val
+					found = true
+				}
+			}
+		}
+		if !found {
 			continue
 		}
-		if strings.EqualFold(valStr, "na") || strings.EqualFold(valStr, "disabled") || valStr == "" {
+		fans = append(fans, FanReading{Name: name, RPM: rpmVal})
-			continue
-		}
-		val, err := parseFanRPMValue(valStr)
-		if err != nil {
-			continue
-		}
-		fans = append(fans, FanReading{
-			Name: strings.TrimSpace(parts[0]),
-			RPM:  val,
-		})
 	}
 	return fans
 }

audit/internal/webui/server.go

@@ -459,7 +459,7 @@ func (h *handler) handleMetricsChartSVG(w http.ResponseWriter, r *http.Request)
 			}
 			vUtil, l := gr.Util.snapshot()
 			datasets = append(datasets, vUtil)
-			names = append(names, fmt.Sprintf("GPU %d %%", idx))
+			names = append(names, fmt.Sprintf("GPU %d", idx))
 			if len(labels) == 0 {
 				labels = l
 			}
@@ -477,7 +477,7 @@ func (h *handler) handleMetricsChartSVG(w http.ResponseWriter, r *http.Request)
 			}
 			vMem, l := gr.MemUtil.snapshot()
 			datasets = append(datasets, vMem)
-			names = append(names, fmt.Sprintf("GPU %d %%", idx))
+			names = append(names, fmt.Sprintf("GPU %d", idx))
 			if len(labels) == 0 {
 				labels = l
 			}
@@ -495,7 +495,7 @@ func (h *handler) handleMetricsChartSVG(w http.ResponseWriter, r *http.Request)
 			}
 			vPow, l := gr.Power.snapshot()
 			datasets = append(datasets, vPow)
-			names = append(names, fmt.Sprintf("GPU %d W", idx))
+			names = append(names, fmt.Sprintf("GPU %d", idx))
 			if len(labels) == 0 {
 				labels = l
 			}
@@ -513,7 +513,7 @@ func (h *handler) handleMetricsChartSVG(w http.ResponseWriter, r *http.Request)
 			}
 			vTemp, l := gr.Temp.snapshot()
 			datasets = append(datasets, vTemp)
-			names = append(names, fmt.Sprintf("GPU %d °C", idx))
+			names = append(names, fmt.Sprintf("GPU %d", idx))
 			if len(labels) == 0 {
 				labels = l
 			}