Plesk pre-upgrade checker gives the following warning:
PLESK_WARN: There are 329 accounts with passwords that are encrypted using an outdated algorithm. Please refer to https://support.plesk.com/hc/articles/115001450829 for instructions on how to change the password type to plain.
The following command provides the same number as in the warning:
# plesk db -Ne "SELECT db.login, d.name FROM domains d, db_users db INNER JOIN (SELECT a.id FROM accounts a WHERE a.type='crypt' AND a.password NOT LIKE '$%') temptable ON temptable.id = db.account_id WHERE d.id=db.dom_id" | wc -l
Misleading warning about database users passwords. Considered as bug #PPPM-11238 and would be fixed in further updates.
No actions required. The warning can be safely ignored.