update CHANGELOG.md

Signed-off-by: Albert <[email protected]>

Author: ac1214

CHANGELOG.md

@@ -19,6 +19,7 @@
 * [ENHANCEMENT] Query Frontend: Add setting `-frontend.forward-headers-list` in frontend  to configure the set of headers from the requests to be forwarded to downstream requests. #4486
 * [ENHANCEMENT] Blocks storage: Add `-blocks-storage.azure.http.*`, `-alertmanager-storage.azure.http.*`, and `-ruler-storage.azure.http.*` to configure the Azure storage client. #4581
 * [ENHANCEMENT] Optimise memberlist receive path when used as a backing store for rings with a large number of members. #4601
+* [ENHANCEMENT] Add a metric `cortex_compactor_remaining_planned_compactions` which will track the remaining planned compactions #4432
 * [BUGFIX] AlertManager: remove stale template files. #4495
 * [BUGFIX] Distributor: fix bug in query-exemplar where some results would get dropped. #4582
 * [BUGFIX] Update Thanos dependency: compactor tracing support, azure blocks storage memory fix. #4585