diff --git a/docs/getting-started/upgrade.md b/docs/getting-started/upgrade.md
index 145960a483a67..d3f2eb47751bd 100644
--- a/docs/getting-started/upgrade.md
+++ b/docs/getting-started/upgrade.md
@@ -34,6 +34,7 @@ type: docs
 
   * The `ClientQuotaCallback#updateClusterMetadata` method is deprecated and will be removed in Kafka 5.0. Custom implementations of `ClientQuotaCallback` no longer need to override this method, as a default no-op implementation is now provided. For further details, please refer to [KIP-1200](https://cwiki.apache.org/confluence/x/axBJFg).
   * The in-memory keystores (used for PEM certificates) now use the default type provided by `KeyStore.getDefaultType()` instead of the hardcoded PKCS12 type.   
+  * New configs have been introduced: remote.copy.lag.bytes, remote.copy.lag.ms and their corresponding broker-level configurations. They allow tiered storage redundancy reduced with delayed upload. For further details, please refer to [KIP-1241](https://cwiki.apache.org/confluence/x/A4LMFw).
 
 ## Upgrading to 4.3.0
 
diff --git a/storage/src/main/java/org/apache/kafka/storage/internals/log/LogConfig.java b/storage/src/main/java/org/apache/kafka/storage/internals/log/LogConfig.java
index c1a6361e50db1..97246fc07ef0b 100644
--- a/storage/src/main/java/org/apache/kafka/storage/internals/log/LogConfig.java
+++ b/storage/src/main/java/org/apache/kafka/storage/internals/log/LogConfig.java
@@ -631,7 +631,7 @@ private static void validateRemoteStorageRetentionTime(Map<String, ?> props) {
         }
     }
 
-    private static void validateRemoteCopyLagTime(Map<?, ?> props) {
+    private static void validateRemoteCopyLagTime(Map<String, ?> props) {
         Long retentionMs = (Long) props.get(TopicConfig.RETENTION_MS_CONFIG);
         Long localRetentionMs = (Long) props.get(TopicConfig.LOCAL_LOG_RETENTION_MS_CONFIG);
         Long remoteCopyLagMs = (Long) props.get(TopicConfig.REMOTE_COPY_LAG_MS_CONFIG);
@@ -644,7 +644,7 @@ private static void validateRemoteCopyLagTime(Map<?, ?> props) {
         }
     }
 
-    private static void validateRemoteCopyLagSize(Map<?, ?> props) {
+    private static void validateRemoteCopyLagSize(Map<String, ?> props) {
         Long retentionBytes = (Long) props.get(TopicConfig.RETENTION_BYTES_CONFIG);
         Long localRetentionBytes = (Long) props.get(TopicConfig.LOCAL_LOG_RETENTION_BYTES_CONFIG);
         Long remoteCopyLagBytes = (Long) props.get(TopicConfig.REMOTE_COPY_LAG_BYTES_CONFIG);