Password policy for Database Secrets Engine for Vault

Guru of Vault,

We are setting up the Database Secrets Engine for Mariadb in Vault to generate dynamic credentials. The password of generated user looks like the following:
A1a-ialfWVgzEEGtR58q.

What is the exact password policy here? Is there any way we can set such policy explicitly? Thanks.

Secrets engines with support for password policies:
Active Directory
Azure
OpenLDAP
RabbitMQ

Thanks for the reply. I understand that the db engine doesn’t support password policies. But is there anyway I can see the policy it’s using internally. Is there any source code I can read?

Basically, we are facing certain auditing situation. The auditors want evidence that the temporary password generated by Vault DB engine will be at least 10 character and have both number and alphabet. It seems true from concrete example. But I cannot find any document for this in Vault. Thanks a lot.