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@@ -0,0 +1,49 @@
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+# e5.2.1
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+
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+## Enhancements
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+
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+- [#11487](https://github.com/emqx/emqx/pull/11487) The bcrypt work factor is limited to the range 5-10, because higher values consume too much CPU resources.
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+ Bcrypt library is updated to allow parallel hash evaluation.
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+
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+- [#11532](https://github.com/emqx/emqx/pull/11532) Improve some error reasons when parsing invalid packets.
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+
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+- [#11568](https://github.com/emqx/emqx/pull/11568) Added support for defining templates for MQTT 5.0 publish properties and user properties in Republish rule action.
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+
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+- [#11612](https://github.com/emqx/emqx/pull/11612) During node evacuation, evacuate all disconnected sessions, not only those started with `clean_start` set to `false`.
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+
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+## Bug Fixes
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+
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+- [#11493](https://github.com/emqx/emqx/pull/11493) Examples and documentation for /api/v5/publish bad request response have been fixed. Previously the documentation example said that the bad request response could return a list in the body which was not actually the case.
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+
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+- [#11499](https://github.com/emqx/emqx/pull/11499) Upgrade Erlang/OTP to 25.3.2-2
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+
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+ Erlang/OTP 25.3.2-2 excludes sensitive data from mnesia_hook log message.
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+
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+- [#11506](https://github.com/emqx/emqx/pull/11506) Don't download a trace log file if it is empty.
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+
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+ After this fix, GET `/api/v5/trace/clientempty/download` returns 404 `{"code":"NOT_FOUND","message":"Trace is empty"}`
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+ If no events matching the trace condition occurred.
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+
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+- [#11522](https://github.com/emqx/emqx/pull/11522) Improved error message for rule engine schema registry when schema name exceeds permissible length.
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+
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+- [#11531](https://github.com/emqx/emqx/pull/11531) Fixed issue where authorization cache cleaning cli was not working properly for specific client ID.
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+
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+- [#11564](https://github.com/emqx/emqx/pull/11564) Fix cluster partition autoheal functionality.
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+ Implement autohealing for the clusters that split into multiple partitions.
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+
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+- [#11568](https://github.com/emqx/emqx/pull/11568) Fixed an issue where an ill-defined built-in rule action config could be interpreted as a custom user function.
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+
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+- [#11394](https://github.com/emqx/emqx/pull/11394) Upgrade Kafka producer client `wolff` from 1.7.6 to 1.7.7.
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+ This fixes a potential race condition which may cause all Kafka producers to crash if some failed to initialize.
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+
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+- [#11401](https://github.com/emqx/emqx/pull/11401) When running one of the rule engine SQL `mongo_date` functions in the EMQX dashboard test interface, the resulting date is formatted as `ISODate(*)`, where * is the date in ISO date format instead of only the ISO date string. This is the format used by MongoDB to store dates.
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+
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+- [#11547](https://github.com/emqx/emqx/pull/11547) Fix several emqx_bridge issues:
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+
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+ - fix Cassandra bridge connect error occurring when the bridge is configured without username/password
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+ (Cassandra doesn't require user credentials when it is configured with `authenticator: AllowAllAuthenticator`)
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+ - fix SQL Server bridge connect error caused by an empty password
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+ - make `username` a required field in Oracle bridge
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+ - fix IoTDB bridge error caused by setting base URL without scheme (e.g. `<host>:<port>`)
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+
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+- [#11630](https://github.com/emqx/emqx/pull/11630) Fixed an issue where the core node could get stuck in the `mria_schema:bootstrap/0` state, preventing new nodes from joining the cluster.
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Ivan Dyachkov