subsystem dml missing in information_schema.innodb_metrics

SELECT name, subsystem, enabled FROM INFORMATION_SCHEMA.INNODB_METRICS where subsystem = 'dml';

Empty set (0.001 sec)

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

| name               | subsystem | enabled |

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

| dml_reads          | dml       |       1 |

| dml_inserts        | dml       |       1 |

| dml_deletes        | dml       |       1 |

| dml_updates        | dml       |       1 |

| dml_system_reads   | dml       |       1 |

| dml_system_inserts | dml       |       1 |

| dml_system_deletes | dml       |       1 |

| dml_system_updates | dml       |       1 |

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