Fix false alert when alert duration less than metric step

src/modules/judge/judge/judge.go

@@ -177,7 +177,13 @@ func judgeItemWithStrategy(stra *model.Stra, historyData []*dataobj.HistoryData,
 		logger.Errorf("wrong step:%+v", firstItem)
 		return
 	}
-	straParam = append(straParam, stra.AlertDur/int(firstItem.Step))
+
+	limit := stra.AlertDur / int(firstItem.Step)
+	if limit <= 0 {
+		limit = 1
+	}
+
+	straParam = append(straParam, limit)
 
 	switch straFunc {
 	case "happen":

src/modules/judge/rpc/push.go

@@ -25,7 +25,7 @@ func (j *Judge) Send(items []*dataobj.JudgeItem, resp *dataobj.SimpleRpcResponse
 		logger.Debug("recv-->", item)
 		stats.Counter.Set("push.in", 1)
 
-		judge.ToJudge(cache.HistoryBigMap[pk[0:2]], pk, item, now)
+		go judge.ToJudge(cache.HistoryBigMap[pk[0:2]], pk, item, now)
 	}
 
 	return nil