feat(nvidia-smi): collect Voltage (XML only)

modules/nvidia_smi/README.md

@@ -34,6 +34,7 @@ Labels per scope:
 | gpu_frame_buffer_memory_usage |  gpu  |   free, used, reserved   |    B    | yes | yes |
 | gpu_bar1_memory_usage         |  gpu  |        free, used        |    B    | yes | no  |
 | gpu_temperature               |  gpu  |       temperature        | Celsius | yes | yes |
+| gpu_voltage                   |  gpu  |         voltage          |    V    | yes | no  |
 | gpu_clock_freq                |  gpu  | graphics, video, sm, mem |   MHz   | yes | yes |
 | gpu_power_draw                |  gpu  |        power_draw        |  Watts  | yes | yes |
 | gpu_performance_state         |  gpu  |          P0-P15          |  state  | yes | yes |

modules/nvidia_smi/charts.go

@@ -19,6 +19,7 @@ const (
 	prioGPUFBMemoryUsage
 	prioGPUBAR1MemoryUsage
 	prioGPUTemperatureChart
+	prioGPUVoltageChart
 	prioGPUClockFreq
 	prioGPUPowerDraw
 	prioGPUPerformanceState
@@ -34,6 +35,7 @@ var (
 		gpuEncoderUtilizationChartTmpl.Copy(),
 		gpuFrameBufferMemoryUsageChartTmpl.Copy(),
 		gpuBAR1MemoryUsageChartTmpl.Copy(),
+		gpuVoltageChartTmpl.Copy(),
 		gpuTemperatureChartTmpl.Copy(),
 		gpuClockFreqChartTmpl.Copy(),
 		gpuPowerDrawChartTmpl.Copy(),
@@ -158,6 +160,17 @@ var (
 			{ID: "gpu_%s_temperature", Name: "temperature"},
 		},
 	}
+	gpuVoltageChartTmpl = module.Chart{
+		ID:       "gpu_%s_voltage",
+		Title:    "Voltage",
+		Units:    "V",
+		Fam:      "voltage",
+		Ctx:      "nvidia_smi.gpu_voltage",
+		Priority: prioGPUVoltageChart,
+		Dims: module.Dims{
+			{ID: "gpu_%s_voltage", Name: "voltage", Div: 1000}, // mV => V
+		},
+	}
 	gpuClockFreqChartTmpl = module.Chart{
 		ID:       "gpu_%s_clock_freq",
 		Title:    "Clock current frequency",
@@ -219,6 +232,9 @@ func (nv *NvidiaSMI) addGPUXMLCharts(gpu xmlGPUInfo) {
 	if !isValidValue(gpu.PowerReadings.PowerDraw) {
 		_ = charts.Remove(gpuPowerDrawChartTmpl.ID)
 	}
+	if !isValidValue(gpu.Voltage.GraphicsVolt) {
+		_ = charts.Remove(gpuVoltageChartTmpl.ID)
+	}
 
 	for _, c := range *charts {
 		c.ID = fmt.Sprintf(c.ID, strings.ToLower(gpu.UUID))

modules/nvidia_smi/collect_xml.go

@@ -53,6 +53,7 @@ func (nv *NvidiaSMI) collectGPUInfoXML(mx map[string]int64) error {
 		addMetric(mx, px+"sm_clock", gpu.Clocks.SmClock, 0)
 		addMetric(mx, px+"mem_clock", gpu.Clocks.MemClock, 0)
 		addMetric(mx, px+"power_draw", gpu.PowerReadings.PowerDraw, 0)
+		addMetric(mx, px+"voltage", gpu.Voltage.GraphicsVolt, 0)
 		for i := 0; i < 16; i++ {
 			if s := "P" + strconv.Itoa(i); gpu.PerformanceState == s {
 				mx[px+"performance_state_"+s] = 1
@@ -130,6 +131,9 @@ type (
 			MinPowerLimit      string `xml:"min_power_limit"`
 			MaxPowerLimit      string `xml:"max_power_limit"`
 		} `xml:"power_readings"`
+		Voltage struct {
+			GraphicsVolt string `xml:"graphics_volt"`
+		} `xml:"voltage"`
 		Processes struct {
 			ProcessInfo []struct {
 				PID         string `xml:"pid"`

modules/nvidia_smi/nvidia_smi_test.go

@@ -161,6 +161,7 @@ func TestNvidiaSMI_Collect(t *testing.T) {
 						"gpu_GPU-473d8d0f-d462-185c-6b36-6fc23e23e571_sm_clock":                           210,
 						"gpu_GPU-473d8d0f-d462-185c-6b36-6fc23e23e571_temperature":                        45,
 						"gpu_GPU-473d8d0f-d462-185c-6b36-6fc23e23e571_video_clock":                        555,
+						"gpu_GPU-473d8d0f-d462-185c-6b36-6fc23e23e571_voltage":                            631,
 					}
 
 					assert.Equal(t, expected, mx)