Update changelog-server.md with EN descriptions of the 23-4 server v… (#5903)

Co-authored-by: Ivan Blinkov <ivan@ydb.tech>

Author: katidisergei

ydb/docs/en/core/changelog-server.md

@@ -1,5 +1,25 @@
 # {{ ydb-short-name }} Server changelog
 
+## Version 23.4 {#23-4}
+
+Release date: May 14, 2024.
+
+**Performance:**
+
+* [Fixed](https://github.com/ydb-platform/ydb/pull/3638) an issue of increased CPU consumption by a topic actor `PERSQUEUE_PARTITION_ACTOR`.
+* [Optimized](https://github.com/ydb-platform/ydb/pull/2083) resource usage by SchemeBoard replicas. The greatest effect is noticeable when modifying the metadata of tables with a large number of partitions.
+
+**Bug fixes:**
+
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/2169) of possible partial commit of accumulated changes when using persistent distributed transactions. This error occurs in an extremely rare combination of events, including restarting tablets that service the table partitions involved in the transaction.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/3165) involving a race condition between the table merge and garbage collection processes, which could result in garbage collection ending with an invariant violation error, leading to an abnormal termination of the `ydbd` server process.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/2696) in Blob Storage, where information about changes to the composition of a storage group might not be received in a timely manner by individual cluster nodes. As a result, reads and writes of data stored in the affected group could become blocked in rare cases, requiring manual intervention.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/3002) in Blob Storage, where data storage nodes might not start despite the correct configuration. The error occurred on systems with the experimental "blob depot" feature explicitly enabled (this feature is disabled by default).
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/2475) that sometimes occurred when writing to a topic with an empty `producer_id` with turned off deduplication. It could lead to abnormal termination of the `ydbd` server process.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/2651) that caused the `ydbd` process to crash due to an incorrect session state when writing to a topic.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/3587) in displaying the metric of number of partitions in a topic, where it previously displayed an incorrect value.
+* [Fixed a bug](https://github.com/ydb-platform/ydb/pull/2126) causing memory leaks that appeared when copying topic data between clusters. These could cause `ydbd` server processes to terminate due to out-of-memory issues.
+
 ## Version 23.3 {#23-3}
 
 Release date: October 12, 2023.