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docs: sync 4.3.13 changes to 4.4.2

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Zaiming (Stone) Shi 2022-03-22 21:26:38 +01:00
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## v4.4.2
**NOTE**: v4.4.2 is in sync with: v4.3.13
### Important changes
* Docker image is based on alpine-3.15.1 (OpenSSL-1.1.1n)
* For docker image, /opt/emqx/etc has been removed from the VOLUME list,
this made it easier for the users to rebuild image on top with changed configs.
### Minor changes
### Enhancements
* Windows package is built on Erlang/OTP 24
* Added debian11 build
### Enhancements (synced from v4.3.13)
* CLI `emqx_ctl pem_cache clean` to force purge x509 certificate cache,
to force an immediate reload of all certificates after the files are updated on disk.
* Refactor the ExProto so that anonymous clients can also be displayed on the dashboard [#6983]
* Force shutdown of processes that cannot answer takeover event [#7026]
* Support set keepalive via queryString & Body HTTP API.
* `topic` parameter in bridge configuration can have `${node}` substitution (just like in `clientid` parameter)
* Add UTF-8 string validity check in `strict_mode` for MQTT packet.
When set to true, invalid UTF-8 strings will cause the client to be disconnected. i.e. client ID, topic name. [#7261]
* Changed systemd service restart delay from 10 seconds to 60 seconds.
* MQTT-SN gateway supports initiative to synchronize registered topics after session resumed. [#7300]
* Add load control app for future development.
* Change the precision of float to 17 digits after the decimal point when formatting a
float using payload templates of rule actions. The old precision is 10 digits before
this change.
### Bug fixes (synced from v4.3.13)
* Fix the `{error,eexist}` error when do release upgrade again if last run failed. [#7121]
* Fix case where publishing to a non-existent topic alias would crash the connection [#6979]
* Fix HTTP-API 500 error on querying the lwm2m client list on the another node [#7009]
* Fix the ExProto connection registry is not released after the client process abnormally exits [#6983]
* Fix Server-KeepAlive wrongly applied on MQTT v3.0/v3.1 [#7085]
* Fix Stomp client can not trigger `$event/client_connection` message [#7096]
* Fix system memory false alarm at boot
* Fix the MQTT-SN message replay when the topic is not registered to the client [#6970]
* Fix rpc get node info maybe crash when other nodes is not ready.
* Fix false alert level log “cannot_find_plugins” caused by duplicate plugin names in `loaded_plugins` files.
* Prompt user how to change the dashboard's initial default password when emqx start.
* Fix errno=13 'Permission denied' Cannot create FIFO boot error in Amazon Linux 2022 (el8 package)
* Fix user or appid created, name only allow `^[A-Za-z]+[A-Za-z0-9-_]*$`
* Fix subscribe http api crash by bad_qos `/mqtt/subscribe`,`/mqtt/subscribe_batch`.
* Send DISCONNECT packet with reason code 0x98 if connection has been kicked [#7309]
## v4.4.1