Merge pull request #21506 from tjungblu/clupdate36

Add changelog for event reuse revert

Author: ahrtr

CHANGELOG/CHANGELOG-3.6.md

@@ -11,6 +11,7 @@ Previous change logs can be found at [CHANGELOG-3.5](https://github.com/etcd-io/
 - [Ensure the metrics interceptor runs before other interceptors so that metrics remain up to date](https://github.com/etcd-io/etcd/pull/21329)
 - Fix [Race between read index and leader change](https://github.com/etcd-io/etcd/pull/21378)
 - Fix [Stale reads caused by process pausing](https://github.com/etcd-io/etcd/pull/21417)
+- Revert [Reuse events between sync loops](https://github.com/etcd-io/etcd/pull/21443)
 
 ### Package `clientv3`