munin.mc:

inventory do
    format "[%s;%s]\n\taddress %s\n\n"

    fields { [ facts["location"], identity, facts["ipaddress"] ] }
end



% mc-inventory --script munin.mc
[hetzner;xen3.xx.net]
        address 213.x.x.x

[hetzner;ns1.yy.net]
        address 78.x.x.x