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As mentioned in this comment, SHOW TABLE STATUS for LevelDB tables is likely to be improved. I will file it as a feature request so it's not forgotten.
Currently the output looks like this:
mysql> create table t1 (pk int auto_increment primary key) engine=LevelDB;
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Query OK, 0 rows affected (0.60 sec)
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mysql> insert into t1 values (null);
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Query OK, 1 row affected (0.01 sec)
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mysql> show table status from test like 't1';
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+------+---------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
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| Name | Engine | Version | Row_format | Rows | Avg_row_length | Data_length | Max_data_length | Index_length | Data_free | Auto_increment | Create_time | Update_time | Check_time | Collation | Checksum | Create_options | Comment |
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+------+---------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
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| t1 | LEVELDB | 10 | Fixed | 1000 | 0 | 0 | 0 | 0 | 0 | 0 | NULL | NULL | NULL | latin1_swedish_ci | NULL | | |
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+------+---------+---------+------------+------+----------------+-------------+-----------------+--------------+-----------+----------------+-------------+-------------+------------+-------------------+----------+----------------+---------+
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1 row in set (0.00 sec)
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That is, most values are zeros, including auto-increment (even although it's shown correctly in SHOW CREATE TABLE). Hopefully it will get better.
Test case:
create table t1 (pk int auto_increment primary key) engine=LevelDB;
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insert into t1 values (null);
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query_vertical show table status from test like 't1';
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It is also covered in leveldb.autoincrement test.
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[MDEV-4197]