auto detect time agg location

model/insight/metric_data.go

@@ -51,6 +51,14 @@ func (m *Metric) GenerateExpression() (string, error){
 
 	return string(expressionBytes), nil
 }
+func (m *Metric) AutoTimeBeforeGroup() bool {
+	for _, item := range m.Items {
+		if item.Statistic == "derivative" {
+			return false
+		}
+	}
+	return true
+}
 
 type MetricItem struct {
 	Name string `json:"name,omitempty"`

plugin/api/insight/metadata.go

@@ -214,7 +214,8 @@ func getMetricData(metric *insight.Metric) (interface{}, error) {
 			agg = aggM["filter_agg"]
 		}
 	}
-	metricData := CollectMetricData(agg, true)
+	timeBeforeGroup :=  metric.AutoTimeBeforeGroup()
+	metricData := CollectMetricData(agg, timeBeforeGroup)
 
 	var targetMetricData []insight.MetricData
 	formula := strings.TrimSpace(metric.Formula)

plugin/api/insight/metric_util.go

@@ -79,7 +79,7 @@ func generateAgg(metricItem *insight.MetricItem, timeField string) map[string]in
 }
 
 func GenerateQuery(metric *insight.Metric) (interface{}, error) {
-	var timeBeforeGroup = true
+	var timeBeforeGroup = metric.AutoTimeBeforeGroup()
 	basicAggs := util.MapStr{}
 	i := 0
 	for _, metricItem := range metric.Items {