From Gentoo Wiki
Metasploit is a security testing framework.
The Metasploit framework is large, therefore it requires many dependencies. It relies heavily on Ruby, so be prepared to have a lot of extra packages pulled in.
Cannot load package information. Is the atom net-analyzer/metasploit correct?
emerge --ask net-analyzer/metasploit
- https://www.offensive-security.com/metasploit-unleashed/ - One of the best free, online security training guides.