add channel test message variable

plugin/api/alerting/channel.go

@@ -264,6 +264,9 @@ func (h *AlertAPI) testChannel(w http.ResponseWriter, req *http.Request, ps http
 	ctx := map[string]interface{}{
 		"title": "INFINI platform test alert message",
 		"message": "This is just a test message, do not reply!",
+		"objects": []string{".infini_metrics"},
+		"trigger_at": time.Now().UnixMilli(),
+		"duration": "5m10s",
 		"rule_id": util.GetUUID(),
 		"rule_name": "test rule",
 		"resource_id": util.GetUUID(),