docs: Generate changelog for v5.1.6

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) Add 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.mqx_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) Introduce 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) Add 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) Upgrade Erlang/OTP to 25.3.2-2
+
+  Erlang/OTP 25.3.2-2 excludes sensitive data from mnesia_hook log message.