mariabackup excessive logging of ddl tracking

MariaDB [(none)]> select space, name from information_schema.INNODB_SYS_TABLESPACES where space=56;

+-------+--------------------------+

| space | name                     |

+-------+--------------------------+

|    56 | mysql/innodb_index_stats |

+-------+--------------------------+

1 row in set (0.001 sec)

# grep DDL /mnt/holland/mariabackup/20220718_205103/mariabackup.log | 

awk '{print $NF}' | sort | uniq -c | head -3

    503 "./mysql/gtid_slave_pos.ibd"

    503 "./mysql/innodb_index_stats.ibd"

    503 "./mysql/innodb_table_stats.ibd"

# awk '/DDL.*innodb_index_stats/ {print $7" "$8" "$9}' /mnt/holland/mariabackup/20220718_205103/mariabackup.log | 

sort | uniq -c

    503 modify 56 "./mysql/innodb_index_stats.ibd"

# awk '/DDL.*innodb_index_stats/ {print}' /mnt/holland/mariabackup/20220718_205103/mariabackup.log |

tail -3

[00] 2022-07-18 20:54:39 DDL tracking : modify 56 "./mysql/innodb_index_stats.ibd"

[00] 2022-07-18 20:54:40 DDL tracking : modify 56 "./mysql/innodb_index_stats.ibd"

[00] 2022-07-18 20:54:41 DDL tracking : modify 56 "./mysql/innodb_index_stats.ibd"