From 2a8f1e6931648ac95fda0d0b3a5858d3dcb40c30 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Sat, 16 May 2020 10:21:17 +0300
Subject: [PATCH] lib/storage: do not increment
 `vm_slow_metric_name_loads_total` counter for  metric_ids which shouldnt be
 prefetched, since this may mislead users

---
 lib/storage/storage.go | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/storage/storage.go b/lib/storage/storage.go
index 2d855691f8..d4f03a4213 100644
--- a/lib/storage/storage.go
+++ b/lib/storage/storage.go
@@ -877,11 +877,11 @@ func (s *Storage) prefetchMetricNames(tsids []TSID) error {
 		metricIDs = append(metricIDs, metricID)
 		tsidsMap[metricID] = &tsids[i]
 	}
-	atomic.AddUint64(&s.slowMetricNameLoads, uint64(len(metricIDs)))
 	if len(metricIDs) < 500 {
 		// It is cheaper to skip pre-fetching and obtain metricNames inline.
 		return nil
 	}
+	atomic.AddUint64(&s.slowMetricNameLoads, uint64(len(metricIDs)))
 
 	// Pre-fetch metricIDs.
 	sort.Sort(metricIDs)