From c43e846e97f98b40b5b68fd7b4967af1e3eeef0e Mon Sep 17 00:00:00 2001
From: SungJin1212 <tjdwls1201@gmail.com>
Date: Thu, 26 Mar 2026 11:25:09 +0900
Subject: [PATCH] Sort upperBound by ascending order

Signed-off-by: SungJin1212 <tjdwls1201@gmail.com>
---
 pkg/util/metrics_helper.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/pkg/util/metrics_helper.go b/pkg/util/metrics_helper.go
index 6dbe6348db..41b71e649c 100644
--- a/pkg/util/metrics_helper.go
+++ b/pkg/util/metrics_helper.go
@@ -1129,6 +1129,9 @@ func mergeHistogram(mf1, mf2 *dto.Metric) {
 			ccValue := cumulativeCount
 			newBucket = append(newBucket, &dto.Bucket{UpperBound: &ubValue, CumulativeCount: &ccValue})
 		}
+		sort.Slice(newBucket, func(i, j int) bool {
+			return newBucket[i].GetUpperBound() < newBucket[j].GetUpperBound()
+		})
 		h1.Bucket = newBucket
 	}
 }