emqx/changes/v5.1.6.en.md

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# v5.1.6
## Enhancements
- [#11429](https://github.com/emqx/emqx/pull/11429) Added option to configure detection of legacy protocol in MondoDB connectors and bridges.
- [#11436](https://github.com/emqx/emqx/pull/11436) Added a new API endpoint `DELETE /banned` to clear all `banned` data.
- [#11438](https://github.com/emqx/emqx/pull/11438) Changed the type of the `mqtt.max_packet_size` from string to byteSize to better represent the valid numeric range.
Strings will still be accepted for backwards compatibility.
- [#11446](https://github.com/emqx/emqx/pull/11446) Refactored datetime-related modules and functions to simplify the code.
- [#11396](https://github.com/emqx/emqx/pull/11396) Introduced topic index for the rule engine runtime that significantly improves the performance of EMQX with a non-trivial number of rules consuming messages matching different topic filters.
## Bug Fixes
- [#11424](https://github.com/emqx/emqx/pull/11424) Added a check for the maximum value of the timestamp in the API to ensure it is a valid Unix timestamp.
- [#11445](https://github.com/emqx/emqx/pull/11445) Removed os_mon application monitor support on Windows platforms to prevent VM crashes.
Functionality remains on non-Windows platforms.
- [#11454](https://github.com/emqx/emqx/pull/11454) Fixed crashing when debugging/tracing with large payloads(introduce when [#11279](https://github.com/emqx/emqx/pull/11279))
- [#11456](https://github.com/emqx/emqx/pull/11456) Removed validation that enforced non-empty PEM for CA cert file.
CA certificate file PEM can now be empty.
- [#11499](https://github.com/emqx/emqx/pull/11499) Upgraded Erlang/OTP to 25.3.2-2.
Erlang/OTP 25.3.2-2 excludes sensitive data from mnesia_hook log message.