Mentat

Note from discussion: it might make sense to import CESNET-VIRTUAL* networks as a separate feed (from Meta iteself). (We now have a "Negistry-like" export with ambition to replace Negistry one, and CERTS members using that over OTRS can act a bit differently to general Meta/Grid clients and clean virtualisation machines.)

Pavel Kácha, should this group map to __GRID__ group which we have in Mentat? Currently, __GRID__ is a manual group and its reporting setting for low is abuse@metacentrum.cz. Or should there be two groups, and the new one would be named abuse@metacentrum.cz and it should report to security@rt.cesnet.cz?

The unmaintained GRID data should go away together with abuse@metacentrum.cz, no matter whether with group name or without, so we can keep the name or change it as we see fit.
I'd say to keep the name sufficiently different to make it visibly distinct, and I'd also vote for keeping new group names independent from mail address format (we've already decoupled it). However, dunders are unnecessary and quite superfluous, so I guess Metacentrum or Grid would do.
And target mail just security@rt.cesnet.cz (parent network mail would be carboncopied implicitly, I presume).