From c4ec9779345decffa87aa3cfc45ef7836288b23b Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Tue, 15 Dec 2020 20:56:16 +0200
Subject: [PATCH] lib/promscrape: properly remove deleted target from
 `/targets` page

Previously `sw` variable wasn't captured correctly by the started goroutine.
---
 lib/promscrape/scraper.go | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/promscrape/scraper.go b/lib/promscrape/scraper.go
index 0570f95e63..901b5a0fb2 100644
--- a/lib/promscrape/scraper.go
+++ b/lib/promscrape/scraper.go
@@ -318,14 +318,14 @@ func (sg *scraperGroup) update(sws []*ScrapeWork) {
 		sg.activeScrapers.Inc()
 		sg.scrapersStarted.Inc()
 		sg.wg.Add(1)
-		go func() {
+		tsmGlobal.Register(sw)
+		go func(sw *ScrapeWork) {
 			defer sg.wg.Done()
 			sc.sw.run(sc.stopCh)
 			tsmGlobal.Unregister(sw)
 			sg.activeScrapers.Dec()
 			sg.scrapersStopped.Inc()
-		}()
-		tsmGlobal.Register(sw)
+		}(sw)
 		sg.m[key] = sc
 		additionsCount++
 	}