chore: add changes

changes/ce/fix-10257.en.md

@@ -0,0 +1,11 @@
+Fixed the issue where `auto_observe` was not working in LwM2M Gateway.
+
+Before the fix, OBSERVE requests were sent without a token, causing failures
+that LwM2M clients could not handle.
+
+After the fix, LwM2M Gateway can correctly observe the resource list carried by
+client, furthermore, unknown resources will be ignored and printing the following
+warning log:
+```
+2023-03-28T18:50:27.771123+08:00 [warning] msg: ignore_observer_resource, mfa: emqx_lwm2m_session:observe_object_list/3, line: 522, peername: 127.0.0.1:56830, clientid: testlwm2mclient, object_id: 31024, reason: no_xml_definition
+```

changes/ce/fix-10257.zh.md

@@ -0,0 +1,8 @@
+修复 LwM2M 网关 `auto_observe` 不工作的问题。
+
+在修复之前，下发的 OBSERVE 请求没有 Token 从而导致 LwM2M 客户端无法处理的失败。
+
+修复后，能正确监听 LwM2M 携带的资源列表、和会忽略未知的资源，并打印以下日志：
+```
+2023-03-28T18:50:27.771123+08:00 [warning] msg: ignore_observer_resource, mfa: emqx_lwm2m_session:observe_object_list/3, line: 522, peername: 127.0.0.1:56830, clientid: testlwm2mclient, object_id: 31024, reason: no_xml_definition
+```