add gpu usage alerts

internal/alerts/alerts.go

@@ -40,13 +40,18 @@ type UserNotificationSettings struct {
 }
 
 type SystemAlertStats struct {
-	Cpu          float64            `json:"cpu"`
-	Mem          float64            `json:"mp"`
-	Disk         float64            `json:"dp"`
-	NetSent      float64            `json:"ns"`
-	NetRecv      float64            `json:"nr"`
-	Temperatures map[string]float32 `json:"t"`
-	LoadAvg      [3]float64         `json:"la"`
+	Cpu          float64                       `json:"cpu"`
+	Mem          float64                       `json:"mp"`
+	Disk         float64                       `json:"dp"`
+	NetSent      float64                       `json:"ns"`
+	NetRecv      float64                       `json:"nr"`
+	GPU          map[string]SystemAlertGPUData `json:"g"`
+	Temperatures map[string]float32            `json:"t"`
+	LoadAvg      [3]float64                    `json:"la"`
+}
+
+type SystemAlertGPUData struct {
+	Usage float64 `json:"u"`
 }
 
 type SystemAlertData struct {

internal/alerts/alerts_system.go

@@ -64,6 +64,8 @@ func (am *AlertManager) HandleSystemAlerts(systemRecord *core.Record, data *syst
 		case "LoadAvg15":
 			val = data.Info.LoadAvg[2]
 			unit = ""
+		case "GPU":
+			val = data.Info.GpuPct
 		}
 
 		triggered := alertRecord.GetBool("triggered")
@@ -206,6 +208,17 @@ func (am *AlertManager) HandleSystemAlerts(systemRecord *core.Record, data *syst
 				alert.val += stats.LoadAvg[1]
 			case "LoadAvg15":
 				alert.val += stats.LoadAvg[2]
+			case "GPU":
+				if len(stats.GPU) == 0 {
+					continue
+				}
+				maxUsage := 0.0
+				for _, gpu := range stats.GPU {
+					if gpu.Usage > maxUsage {
+						maxUsage = gpu.Usage
+					}
+				}
+				alert.val += maxUsage
 			default:
 				continue
 			}