From 240feb313b5fcffe83c5b04a7cb6d3fa29d28d9e Mon Sep 17 00:00:00 2001
From: Tom Wilkie <tom.wilkie@gmail.com>
Date: Wed, 12 Jul 2017 15:54:38 +0100
Subject: [PATCH] Don't regenerate label set for cached values.

---
 retrieval/scrape.go | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/retrieval/scrape.go b/retrieval/scrape.go
index ebfc3b4c02..26fe8a4b80 100644
--- a/retrieval/scrape.go
+++ b/retrieval/scrape.go
@@ -751,9 +751,8 @@ loop:
 		}
 
 		ref, ok := sl.cache.getRef(yoloString(met))
-		var lset labels.Labels
-		p.Metric(&lset)
 		if ok {
+			lset := sl.cache.lsets[ref].lset
 			switch err = app.AddFast(lset, ref, t, v); err {
 			case nil:
 				if tp == nil {