emqx/changes/ce/breaking-12634.en.md

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Triple-quote string values in HOCON config files no longer support escape sequence.
The detailed information can be found in [this pull request](https://github.com/emqx/hocon/pull/290).
Here is a summary for the impact on EMQX users:
- EMQX 5.6 is the first version to generate triple-quote strings in `cluster.hocon`,
meaning for generated configs, there is no compatibility issue.
- For user hand-crafted configs (such as `emqx.conf`) a thorough review is needed
to inspect if escape sequences are used (such as `\n`, `\r`, `\t` and `\\`), if yes,
such strings should be changed to regular quotes (one pair of `"`) instead of triple-quotes.