Longview sum localhost traffic so all mysql and varnish <-> apache traffic is added togheter.
i just want to know the public address traffic.

There is a way to exclude localhost and private address ?

Longview does show you public vs private traffic. Excluding localhost traffic however isn't possible unless you modify the code yourself: https://github.com/linode/longview

Using a Unix socket for MySQL will remove its traffic. I'm not sure about Varnish though.