Merge pull request #17728 from Akiqqqqqqq/changelog-add-wal-write-tim…

…e-metric

CHANGELOG:add wal write system call metrics observation

CHANGELOG/CHANGELOG-3.5.md

@@ -8,6 +8,7 @@ Previous change logs can be found at [CHANGELOG-3.4](https://github.com/etcd-io/
 
 ### etcd server
 - Fix [LeaseTimeToLive returns error if leader changed](https://github.com/etcd-io/etcd/pull/17704).
+- Add [metrics `etcd_disk_wal_write_duration_seconds`](https://github.com/etcd-io/etcd/pull/17616).
 
 ### Package `clientv3`
 - Add [requests retry when receiving ErrGPRCNotSupportedForLearner and endpoints > 1](https://github.com/etcd-io/etcd/pull/17641).