refactor: sub alert add host filter

alert/dispatch/dispatch.go

@@ -595,6 +595,10 @@ func (e *Dispatch) handleSub(sub *models.AlertSubscribe, event models.AlertCurEv
 		return
 	}
 
+	if !sub.MatchCate(event.Cate) {
+		return
+	}
+
 	if !common.MatchTags(event.TagsMap, sub.ITags) {
 		return
 	}

models/alert_subscribe.go

@@ -392,6 +392,17 @@ func (s *AlertSubscribe) MatchProd(prod string) bool {
 	return s.Prod == prod
 }
 
+func (s *AlertSubscribe) MatchCate(cate string) bool {
+	if s.Cate == "" {
+		return true
+	}
+
+	if s.Cate == "host" {
+		return cate == "host"
+	}
+	return true
+}
+
 func (s *AlertSubscribe) MatchCluster(dsId int64) bool {
 	// 没有配置数据源, 或者事件不需要关联数据源
 	// do not match any datasource or event not related to datasource