Question : I'm see the following in my DNS logs, what does it mean.

Mar  4 13:56:48 ns0 named[2330]: success resolving 'NS5.DNS.BR/A' (in 'BR'?) after disabling EDNS

Answer : I'm see the following in my DNS logs, what does it mean.

Well to me it means that you dns server did a look up for the host name NS5.DNS.BR to try and find it IP V4 address and successfully did it.

IP V4 addresses are type A records, a IP V6 address uses type AAAA records.