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docs: update CHANGES-4.4

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Zaiming (Stone) Shi 2021-12-30 00:35:52 +01:00
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CHANGES-4.4.md
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@ -4,27 +4,39 @@
### Important changes
- **For Debian/Ubuntu users**, Debian/Ubuntu package (deb) installed EMQ X now now run on systemd. This is to use systemd's supervision functionality to ensure that EMQ X service restarts after a crash. The package installation service upgrade from init.d to systemd has been verified, but it is still recommended that you verify and confirm again before deploying to the production environment, at least to ensure that systemd is available in your system
- **For Debian/Ubuntu users**, Debian/Ubuntu package (deb) installed EMQ X is now started from systemd.
This is to use systemd's supervision functionality to ensure that EMQ X service restarts after a crash.
The package installation service upgrade from init.d to systemd has been verified,
it is still recommended that you verify and confirm again before deploying to the production environment,
at least to ensure that systemd is available in your system
- MongoDB authentication supports DNS SRV and TXT Records resolution, which can seamlessly connect with MongoDB Altas
- Support dynamic modification of MQTT Keep Alive to adapt to different energy consumption strategies
- Support dynamic modification of MQTT Keep Alive to adapt to different energy consumption strategies.
### Minor changes
- Bumpped default boot wait time from 15 seconds to 150 seconds
because in some simulated environments it may take up to 70 seconds to boot in build CI
- Dashboard supports relative paths and custom access paths
- Supports configuring whether to forward retained messages with empty payload to suit users who are still using MQTT v3.1. The relevant configurable item is `retainer.stop_publish_clear_msg`
- Supports configuring whether to forward retained messages with empty payload to suit users
who are still using MQTT v3.1. The relevant configurable item is `retainer.stop_publish_clear_msg`
- Multi-language hook extension (ExHook) supports dynamic cancellation of subsequent forwarding of client messages
- Rule engine SQL supports the use of single quotes in FROM clause, for example: `SELECT * FROM't/#'`
- Rule engine SQL supports the use of single quotes in `FROM` clauses, for example: `SELECT * FROM 't/#'`
- Change the default value of the `max_topic_levels` configurable item to 128. Previously, it had no limit (configured to 0), which may be a potential DoS threat
- Change the default value of the `max_topic_levels` configurable item to 128.
Previously, it had no limit (configured to 0), which may be a potential DoS threat
- Improve the error log content when the Proxy Protocol message is received but the `proxy_protocol` configuration is not turned on
- Improve the error log content when the Proxy Protocol message is received without `proxy_protocol` configured.
- Add additional message attributes to the message reported by the gateway. Messages from gateways such as CoAP, LwM2M, Stomp, ExProto, etc., when converted to EMQ X messages, add fields such as protocol name, protocol version, user name, client IP, etc., which can be used for multi-language hook extension (ExHook)
- Add additional message attributes to the message reported by the gateway.
Messages from gateways such as CoAP, LwM2M, Stomp, ExProto, etc., when converted to EMQ X messages,
add fields such as protocol name, protocol version, user name, client IP, etc.,
which can be used for multi-language hook extension (ExHook)
- HTTP client performance improvement