feat(alerting): improve error logging for extracting alerts

ref #6576

pkg/services/alerting/rule.go

@@ -27,10 +27,31 @@ type Rule struct {
 
 type ValidationError struct {
 	Reason      string
+	Err         error
+	Alertid     int64
+	DashboardId int64
+	PanelId     int64
 }
 
 func (e ValidationError) Error() string {
-	return e.Reason
+	extraInfo := ""
+	if e.Alertid != 0 {
+		extraInfo = fmt.Sprintf("%s AlertId: %v", extraInfo, e.Alertid)
+	}
+
+	if e.PanelId != 0 {
+		extraInfo = fmt.Sprintf("%s PanelId: %v ", extraInfo, e.PanelId)
+	}
+
+	if e.DashboardId != 0 {
+		extraInfo = fmt.Sprintf("%s DashboardId: %v", extraInfo, e.DashboardId)
+	}
+
+	if e.Err != nil {
+		return fmt.Sprintf("%s %s%s", e.Err.Error(), e.Reason, extraInfo)
+	}
+
+	return fmt.Sprintf("Failed to extract alert.Reason: %s %s", e.Reason, extraInfo)
 }
 
 var (
@@ -83,7 +104,7 @@ func NewRuleFromDBAlert(ruleDef *m.Alert) (*Rule, error) {
 	for _, v := range ruleDef.Settings.Get("notifications").MustArray() {
 		jsonModel := simplejson.NewFromAny(v)
 		if id, err := jsonModel.Get("id").Int64(); err != nil {
-			return nil, ValidationError{Reason: "Invalid notification schema"}
+			return nil, ValidationError{Reason: "Invalid notification schema", DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
 		} else {
 			model.Notifications = append(model.Notifications, id)
 		}
@@ -93,10 +114,10 @@ func NewRuleFromDBAlert(ruleDef *m.Alert) (*Rule, error) {
 		conditionModel := simplejson.NewFromAny(condition)
 		conditionType := conditionModel.Get("type").MustString()
 		if factory, exist := conditionFactories[conditionType]; !exist {
-			return nil, ValidationError{Reason: "Unknown alert condition: " + conditionType}
+			return nil, ValidationError{Reason: "Unknown alert condition: " + conditionType, DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
 		} else {
 			if queryCondition, err := factory(conditionModel, index); err != nil {
-				return nil, err
+				return nil, ValidationError{Err: err, DashboardId: model.DashboardId, Alertid: model.Id, PanelId: model.PanelId}
 			} else {
 				model.Conditions = append(model.Conditions, queryCondition)
 			}