emqx4.3/changes/ce/fix-14289.en.md

Fix log file path issue when importing config from a different environment.

Environment variable EMQX_LOG_DIR in docker is /opt/emqx/log, but /var/log/emqx/ when installed from RPM/DEB packages.

Prior to this fix, log file paths (default file handler and audit handler) are environment-variable interpolated when being exported. This causes the config import to a different environment crash due to the directory being absent.

This fix ensures that the log file paths are not environment-variable interpolated when being exported. It also made sure that the absolute paths log directory from old version export are converted back to environment-variable if the path does not exist in the new environment.