fix: nodata strategy does not work when index or tsdb down

src/modules/judge/judge/judge.go

@@ -309,8 +309,8 @@ func GetReqs(stra *model.Stra, metric string, endpoints []string, now int64) ([]
 				Endpoint: index.Endpoint,
 				Metric:   index.Metric,
 				Tag:      "",
-				Step:     index.Step,
-				Dstype:   index.Dstype,
+				Step:     10,
+				Dstype:   "GAUGE",
 				TS:       now,
 			}
 			lostSeries = append(lostSeries, s)

src/modules/judge/judge/nodata.go

@@ -47,6 +47,7 @@ func nodataJudge() {
 					Tags:     "",
 					TagsMap:  map[string]string{},
 					DsType:   "GAUGE",
+					Step:     10,
 				}
 
 				nodataJob.Acquire()

src/modules/transfer/backend/query.go

@@ -178,6 +178,9 @@ func fetchDataSync(start, end int64, consolFun, endpoint, counter string, step i
 	if err != nil {
 		logger.Warningf("fetch tsdb data error: %+v", err)
 		stats.Counter.Set("query.data.err", 1)
+		data.Endpoint = endpoint
+		data.Counter = counter
+		data.Step = step
 	}
 	dataChan <- data
 }