APT proxy for multiple repos of the same distribution

Sonatype Nexus Repository
1

Do i need to create separate repo proxies for xenial, xenial-security and xenial-updates ?

I want to introduce a nexus proxy for a client config like

deb http://ca.ports.ubuntu.com/ubuntu-ports/ xenial main universe
deb http://ca.ports.ubuntu.com/ubuntu-ports/ xenial-security main universe
deb http://ca.ports.ubuntu.com/ubuntu-ports/ xenial-updates main universe

but i’m not sure if these are all considered 1 single distribution (xenial) or 3 by nexus for the sake of proxying

2

If you’re using the proxy then one Nexus repository is enough.

You need to specify the default distribution, for example, xenial in your case, then use it as you would normally with the deb sources.