docs: update changelog for 4.4
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Zaiming (Stone) Shi
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# EMQX 4.4 Changes
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## v4.4.4
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### Enhancements (synced from v4.3.15)
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* Refactored `bin/emqx` help messages.
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* Upgrade script refuses upgrade from incompatible versions. (e.g. hot upgrade from 4.3 to 4.4 will fail fast).
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* Made possible for EMQX to boot from a Linux directory which has white spaces in its path.
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* Add support for JWT authorization [#7596]
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Now MQTT clients may be authorized with respect to a specific claim containing publish/subscribe topic whitelists.
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* Better randomisation of app screts (changed from timestamp seeded sha hash (uuid) to crypto:strong_rand_bytes)
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* Return a client_identifier_not_valid error when username is empty and username_as_clientid is set to true [#7862]
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* Add more rule engine date functions: format_date/3, format_date/4, date_to_unix_ts/4 [#7894]
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* Add proto_name and proto_ver fields for $event/client_disconnected event.
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* Mnesia auth/acl http api support multiple condition queries.
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* Inflight QoS1 Messages for shared topics are now redispatched to another alive subscribers upon chosen subscriber session termination.
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* Make auth metrics name more understandable.
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### Bug fixes (synced from v4.3.15)
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* List subscription topic (/api/v4/subscriptions), the result do not match with multiple conditions.
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* SSL closed error bug fixed for redis client.
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* Fix mqtt-sn client disconnected due to re-send a duplicated qos2 message
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* Rule-engine function hexstr2bin/1 support half byte [#7977]
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* Add rule-engine function float2str/2, user can specify the float output precision [#7991]
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* Improved resilience against autocluster partitioning during cluster
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startup. [#7876]
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[ekka-158](https://github.com/emqx/ekka/pull/158)
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* Add regular expression check ^[0-9A-Za-z_\-]+$ for node name [#7979]
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## v4.4.3
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** NOTE**: v4.4.3 is in sync with v4.3.14
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### Enhancements
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* Add rule events: client.connack, client.check_acl_complete
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- client.connack The rule event is triggered when the server sends a CONNACK packet to the client. reason_code contains the error reason code.
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- client.check_acl_complete The rule event is triggered when the client check acl complete.
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### Enhancements (synced from v4.3.14)
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* Add `RequestMeta` for exhook.proto in order to expose `cluster_name` of emqx in each gRPC request. [#7524]
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* Support customize emqx_exhook execution priority. [#7408]
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* add api: PUT /rules/{id}/reset_metrics.
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This api reset the metrics of the rule engine of a rule, and reset the metrics of the action related to this rule. [#7474]
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* Enhanced rule engine error handling when json parsing error.
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* Add support for `RSA-PSK-AES256-GCM-SHA384`, `RSA-PSK-AES256-CBC-SHA384`,
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`RSA-PSK-AES128-GCM-SHA256`, `RSA-PSK-AES128-CBC-SHA256` PSK ciphers, and remove `PSK-3DES-EDE-CBC-SHA`,
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`PSK-RC4-SHA` from the default configuration. [#7427]
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* Diagnostic logging for mnesia `wait_for_table`
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- prints check points of mnesia internal stats
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- prints check points of per table loading stats
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Help to locate the problem of long table loading time.
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* Add `local` strategy for Shared Subscription.
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That will preferentially dispatch messages to a shared subscriber at the same
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node. It will improves the efficiency of shared messages dispatching in certain
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scenarios, especially when the emqx-bridge-mqtt plugin is configured as shared
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subscription. [#7462]
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* Add some compression functions to rule-engine: gzip, gunzip, zip, unzip, zip_compress, zip_uncompress
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### Bug Fixes (synced from v4.3.14)
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* Prohibit empty topics in strict mode
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* Make sure ehttpc delete useless pool always succeed.
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* Update mongodb driver to fix potential process leak.
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* Fix a potential security issue #3155 with emqx-dashboard plugin.
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In the earlier implementation, the Dashboard password is reset back to the
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default value of emqx_dashboard.conf after the node left cluster.
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Now we persist changed password to protect against reset. [#7518]
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* Silence grep/sed warnings in docker-entrypoint.sh. [#7520]
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* Generate `loaded_modules` and `loaded_plugins` files with default values when no such files exists. [#7520]
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* Fix the configuration `server_name_indication` set to disable does not take effect.
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* Fix backup files are not deleted and downloaded correctly when the API path has ISO8859-1 escape characters.
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## v4.4.2
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**NOTE**: v4.4.2 is in sync with: v4.3.13
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