These are the packages that would be merged, in order:

Calculating dependencies ... done!
Dependency resolution took 1.00 s (backtrack: 0/20).

[ebuild  N     ] dev-perl/SNMP_Session-1.160.0::gentoo  USE="-test" PERL_FEATURES="ithreads (-debug) -quadmath" 178 KiB
[ebuild  N     ] net-analyzer/mrtg-2.17.10-r1::gentoo  USE="(-selinux)" 1060 KiB

Total: 2 packages (2 new), Size of downloads: 1237 KiB