For very fact import an audit record is written although nothing changes.

#<Audited::Audit id: 8238963, auditable_id: 30056, auditable_type: "Nic::Managed", user_id: 4, user_type: nil, username: "API Admin", action: "update", audited_changes: {"attrs"=>[{"mtu"=>"1500", "netmask"=>"255.255.224.0", "netmask6"=>"ffff:ffff:ffff:ffff::", "network"=>"172.22.0.0", "network6"=>"fe80::"}, {"mtu"=>1500, "netmask"=>"255.255.224.0", "netmask6"=>"ffff:ffff:ffff:ffff::", "network"=>"172.22.0.0", "network6"=>"fe80::"}]}, version: 7, comment: nil, associated_id: 23973, associated_type: "Host::Base", request_uuid: "7263349c-f216-415a-8721-f7464856031e", created_at: "2018-10-29 10:08:25", remote_address: "1.2.3.4", auditable_name: "xxxxx...", associated_name: "xxxx...">