Important: #97145 - Serialized log_data in sys_log migrated to JSON-encoded data

See Issue #97145

Description

TYPO3’s sys_log database table contains a field log_data, which is used by TYPO3 Core internally to store additional information for log details. This field has been previously filled with a serialized string (PHP function serialize()) and has now been migrated to a JSON-encoded field (PHP function json_encode()).

An Upgrade Wizard migrates the field values of existing sys_log entries to the new format automatically.

Impact

Additional information are now stored as JSON-encoded data in the log_data field of table sys_log.