From 62d7e07ff75c191a098b261f9ffeca5484f9e942 Mon Sep 17 00:00:00 2001
From: Aliaksandr Valialkin <valyala@gmail.com>
Date: Tue, 2 Mar 2021 17:54:31 +0200
Subject: [PATCH] lib/promrelabel: remove unneded optimizations for `labeldrop`
 and `labelkeep` actions

These optimizations may slow down code execution by matching the same label against regexp two times instead of a single time
---
 lib/promrelabel/relabel.go | 22 ----------------------
 1 file changed, 22 deletions(-)

diff --git a/lib/promrelabel/relabel.go b/lib/promrelabel/relabel.go
index 477cf2bea..1ee0e9868 100644
--- a/lib/promrelabel/relabel.go
+++ b/lib/promrelabel/relabel.go
@@ -225,17 +225,6 @@ func (prc *parsedRelabelConfig) apply(labels []prompbmarshal.Label, labelsOffset
 		}
 		return labels
 	case "labeldrop":
-		keepSrc := true
-		for i := range src {
-			label := &src[i]
-			if prc.matchString(label.Name) {
-				keepSrc = false
-				break
-			}
-		}
-		if keepSrc {
-			return labels
-		}
 		dst := labels[:labelsOffset]
 		for i := range src {
 			label := &src[i]
@@ -245,17 +234,6 @@ func (prc *parsedRelabelConfig) apply(labels []prompbmarshal.Label, labelsOffset
 		}
 		return dst
 	case "labelkeep":
-		keepSrc := true
-		for i := range src {
-			label := &src[i]
-			if !prc.matchString(label.Name) {
-				keepSrc = false
-				break
-			}
-		}
-		if keepSrc {
-			return labels
-		}
 		dst := labels[:labelsOffset]
 		for i := range src {
 			label := &src[i]