hni61223 commented on code in PR #15478:
URL: https://github.com/apache/kafka/pull/15478#discussion_r1514278368


##########
core/src/main/scala/kafka/raft/KafkaMetadataLog.scala:
##########
@@ -677,4 +675,38 @@ object KafkaMetadataLog extends Logging {
       Snapshots.deleteIfExists(logDir, snapshotId)
     }
   }
+
+  private sealed trait SnapshotDeletionReason {
+    def reason(snapshotId: OffsetAndEpoch): String
+  }
+
+  private final case class RetentionMsBreach(now: Long, timestamp: Long, 
retentionMillis: Long) extends SnapshotDeletionReason {
+    override def reason(snapshotId: OffsetAndEpoch): String = {
+      s"""Marking snapshot $snapshotId for deletion because it timestamp 
($timestamp) is now ($now) older than the

Review Comment:
   nit: it's timestamp



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