From cb12a8f0a8ac9979d9e0382707a3c8e2e65b4ddd Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Wed, 7 Apr 2021 23:33:40 +0300
Subject: [PATCH] app/vmselect: return `data:null` instead of `data:[]` from
 `/api/v1/query_exemplars`, since Grafana throws an error otherwise

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/1186
---
 app/vmselect/main.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/vmselect/main.go b/app/vmselect/main.go
index f6e86facc..cdf21b952 100644
--- a/app/vmselect/main.go
+++ b/app/vmselect/main.go
@@ -372,7 +372,7 @@ func RequestHandler(w http.ResponseWriter, r *http.Request) bool {
 		// Return dumb placeholder for https://prometheus.io/docs/prometheus/latest/querying/api/#querying-exemplars
 		queryExemplarsRequests.Inc()
 		w.Header().Set("Content-Type", "application/json; charset=utf-8")
-		fmt.Fprintf(w, "%s", `{"status":"success","data":[]}`)
+		fmt.Fprintf(w, "%s", `{"status":"success","data":null}`)
 		return true
 	case "/api/v1/admin/tsdb/delete_series":
 		deleteRequests.Inc()