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vmselect: update /query_exemplars placeholder (#2000)

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Grafana expects `data` in response to be a slice and logs an err
if it is not:
```
err="[]v1.ExemplarQueryResult: decode slice: expect [ or n, but found , error found in #0 byte of ...||..., bigger context ...||..."
```

https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1999
Signed-off-by: hagen1778 <roman@victoriametrics.com>
This commit is contained in:
Roman Khavronenko 2021-12-23 11:53:50 +02:00 committed by Aliaksandr Valialkin
parent c1722003a2
commit d1c474c5b3
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1 changed files with 1 additions and 1 deletions
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2
app/vmselect/main.go
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@ -524,7 +524,7 @@ func selectHandler(startTime time.Time, w http.ResponseWriter, r *http.Request,
// Return dumb placeholder for https://prometheus.io/docs/prometheus/latest/querying/api/#querying-exemplars
queryExemplarsRequests.Inc()
w.Header().Set("Content-Type", "application/json")
fmt.Fprintf(w, "%s", `{"status":"success","data":null}`)
fmt.Fprintf(w, "%s", `{"status":"success","data":[]}`)
return true
default:
return false