Wikipedia:PSR

While all users are strongly advised to maintain a strong password, the policy requirements are only binding on the following user groups:

Additionally, the community recommended that global policy require the steward and founder user groups follow these same requirements. Jimbo Wales, as sole member of the "founder" user group, to comply with these requirements.

A password strength meter is to be added to the signup/change password screen in order to assist users in determining if their password is considered strong.

A password strength bar (yet to be implemented) will help these users determine if they are meeting these requirements. Regular auditing of administrator and functionary passwords is to be done by the Foundation, through a process and at intervals as yet to be determined.

Users with advanced permissions who are found to be out of compliance with these requirements may have their permissions revoked until they have made adequate assurances that they have rectified the issue. Users who repeatedly fail to maintain a strong password may have their permissions permanently revoked by the Arbitration Committee.

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Wikipedia