get event message list with default order by updated

plugin/api/alerting/message.go

@@ -260,11 +260,11 @@ func (h *AlertAPI) searchAlertMessage(w http.ResponseWriter, req *http.Request,
 
 	if sort != "" {
 		sortParts := strings.Split(sort, ",")
-		if len(sortParts) == 2 && sortParts[1] != "created" {
+		if len(sortParts) == 2 && sortParts[1] != "updated" {
 			sortBuilder.WriteString(fmt.Sprintf(`{"%s":{ "order": "%s"}},`, sortParts[0], sortParts[1]))
 		}
 	}
-	sortBuilder.WriteString(`{"created":{ "order": "desc"}}`)
+	sortBuilder.WriteString(`{"updated":{ "order": "desc"}}`)
 
 	if status != "" {
 		mustBuilder.WriteString(",")

service/alerting/elasticsearch/engine.go

@@ -671,7 +671,7 @@ func (engine *Engine) Do(rule *alerting.Rule) error {
 	conditionResults := checkResults.ResultItems
 	var paramsCtx map[string]interface{}
 	if len(conditionResults) == 0 {
-		alertItem.Priority = "info"
+		alertItem.Priority = ""
 		if checkResults.QueryResult.Nodata {
 			alertItem.State =  alerting.AlertStateNodata
 		}