Hi,
The exact feature that replaces Qualys vulnerability assessment is Vulnerability assessment for machines:
It is available for both P1 and P2 plans. Vulnerability assessment agent details.. You can find more information about the feature here. There you will find all the documentation about it + the deprecated Qualys which was used for the same feature. There is even Common questions document. There are certain capabilities of Vulnerability assessment that are only available in P2.
Please "Accept the answer" if the information helped you. This will help us and others in the community as well.