update group data struct

model/alerting/metric.go

@@ -17,6 +17,12 @@ type Metric struct {
 	Title string `json:"title"` //text template
 	Message string `json:"message"` // text template
 	FormatType string `json:"format_type,omitempty"`
+	Groups []MetricGroupItem `json:"groups"` //bucket group
+}
+
+type MetricGroupItem struct {
+	Field string `json:"field"`
+	Limit int `json:"limit"`
 }
 func (m *Metric) GenerateExpression() (string, error){
 	if len(m.Items) == 1 {
@@ -45,8 +51,6 @@ type MetricItem struct {
 	Name string `json:"name"`
 	Field string `json:"field"`
 	Statistic string `json:"statistic"`
-	Group []string `json:"group"` //bucket group
-	Limit int `json:"limit"`
 }
 
 type QueryResult struct {

service/alerting/elasticsearch/engine.go

@@ -76,19 +76,19 @@ func (engine *Engine) GenerateQuery(rule *alerting.Rule, filterParam *alerting.F
 	}
 
 	var rootAggs util.MapStr
-	groups := rule.Metrics.Items[0].Group
+	groups := rule.Metrics.Groups
-	limit := rule.Metrics.Items[0].Limit
-	//top group 10
-	if limit <= 0 {
-		limit = 10
-	}
 	if grpLength := len(groups); grpLength > 0 {
 		var lastGroupAgg util.MapStr
 
 		for i := grpLength-1; i>=0; i-- {
+			limit := groups[i].Limit
+			//top group 10
+			if limit <= 0 {
+				limit = 10
+			}
 			groupAgg := util.MapStr{
 				"terms": util.MapStr{
-					"field": groups[i],
+					"field": groups[i].Field,
 					"size": limit,
 				},
 			}