mysql.transaction_registry table was introduced in MariaDB 10.3.4 as part of system-versioned tables. It is used for transaction-precise versioning, and contains the following fields:
|begin_timestamp||timestamp(6)||NO||Multiple||0000-00-00 00:00:00.000000||Timestamp when the transaction began (BEGIN statement), however see MDEV-16024.|
|commit||timestamp(6)||NO||Multiple||0000-00-00 00:00:00.000000||Timestamp when the transaction was committed.|
|isolation_level||enum('READ-UNCOMMITTED','READ-COMMITTED','REPEATABLE-READ','SERIALIZABLE')||NO||NULL||Transaction isolation level.|
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