CHANGELOG: update

Signed-off-by: Gyuho Lee <leegyuho@amazon.com>

CHANGELOG-3.5.md

@@ -91,6 +91,7 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - Add [`etcd_server_client_requests_total` with `"type"` and `"client_api_version"` labels](https://github.com/etcd-io/etcd/pull/11687).
 - Add [`etcd_wal_write_bytes_total`](https://github.com/etcd-io/etcd/pull/11738).
 - Add [`etcd_debugging_auth_revision`](https://github.com/etcd-io/etcd/commit/f14d2a087f7b0fd6f7980b95b5e0b945109c95f3).
+- Add [`os_fd_used` and `os_fd_limit` to monitor current OS file descriptors](https://github.com/etcd-io/etcd/pull/12214).
 
 ### etcd server
 
@@ -130,12 +131,16 @@ Note that any `etcd_debugging_*` metrics are experimental and subject to change.
 - Add [`--unsafe-no-fsync`](https://github.com/etcd-io/etcd/pull/11946) flag.
   - Setting the flag disables all uses of fsync, which is unsafe and will cause data loss. This flag makes it possible to run an etcd node for testing and development without placing lots of load on the file system.
 - Add [etcd --auth-token-ttl](https://github.com/etcd-io/etcd/pull/11980) flag to customize `simpleTokenTTL` settings.
-- Improve [runtime.FDUsage objects malloc of Memory Usage and CPU Usage](https://github.com/etcd-io/etcd/pull/11986).
+- Improve [`runtime.FDUsage` call pattern to reduce objects malloc of Memory Usage and CPU Usage](https://github.com/etcd-io/etcd/pull/11986).
 - Improve [mvcc.watchResponse channel Memory Usage](https://github.com/etcd-io/etcd/pull/11987).
 - Log [expensive request info in UnaryInterceptor](https://github.com/etcd-io/etcd/pull/12086).
 - [Fix invalid Go type in etcdserverpb](https://github.com/etcd-io/etcd/pull/12000).
 - [Improve healthcheck by using v3 range request and its corresponding timeout](https://github.com/etcd-io/etcd/pull/12195).
 
+### Package `runtime`
+
+- Optimize [`runtime.FDUsage` by removing unnecessary sorting](https://github.com/etcd-io/etcd/pull/12214).
+
 ### Package `embed`
 
 - Remove [`embed.Config.Debug`](https://github.com/etcd-io/etcd/pull/10947).