Both the reference configuration and docs/aoa/network.rst offer the option
under [network]:
[network]
hide_zero=True
hide_threshold_bytes=0
but NetworkPlugin never read it, so it stayed at the base class default of
0 whatever the user wrote. diskio has read it since the option was added;
network was left out.
Nothing reports an option a plugin ignores: hide_zero keeps working, it
just never applies the threshold, so an interface carrying a trickle of
background traffic is shown when the user asked for it to be hidden.
Read it beside hide_zero, exactly as diskio does.