Version 22.8.0 is available upstream. Please consider updating! It seems that version 22.8.0 is available upstream, while the latest version in the Gentoo tree is 22.7.1. You think this warning is false? Read more about it here.
This is an OSP server implementation to allow GVM to remotely control OpenVAS.
Once running, you need to configure OpenVAS for the Greenbone Vulnerability Manager, for example via the web interface Greenbone Security Assistant. Then you can create scan tasks to use OpenVAS.