diff --git a/CHANGELOG.md b/CHANGELOG.md
index e63d0039a11..524dcfacef2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,7 +13,8 @@ We use _breaking :warning:_ to mark changes that are not backward compatible (re
 ## Unreleased
 
 ### Added
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+- [#4117](https://github.com/thanos-io/thanos/pull/4117) Mixin:  new alert ThanosReceiveTrafficBelowThreshold to flag if the ingestion average of the last hour is 50% of the ingestion average for the last 12 hours.
+
 ### Fixed
 -
 ### Changed