update changelog

Signed-off-by: Ben Ye <[email protected]>

Author: yeya24

CHANGELOG.md

@@ -43,6 +43,7 @@
 * [ENHANCEMENT] Compactor: Optimize cleaner run time. #6815
 * [ENHANCEMENT] Parquet Storage: Allow percentage based dynamic shard size for Parquet Converter. #6817
 * [ENHANCEMENT] Query Frontend: Enhance the performance of the JSON codec. #6816
+* [ENHANCEMENT] Metadata Cache: Support inmemory and multi level cache backend. #6829
 * [BUGFIX] Ingester: Avoid error or early throttling when READONLY ingesters are present in the ring #6517
 * [BUGFIX] Ingester: Fix labelset data race condition. #6573
 * [BUGFIX] Compactor: Cleaner should not put deletion marker for blocks with no-compact marker. #6576