Monitor Network Only

Looking for help with configuring netdata to just monitor network usage and nothing else. I would also want to store 1 month worth of the network usage data.

I want to limit also the amount of ram its using to bare minimum since most of the servers it will be monitoring have as little as 512mb of ram and about 5-10gb storage, so netdata needs to use as little resource as possible. If it would lessen the load on the server, I could go without a web interface on a per node installation and just use the interface.

Generally Im using the script and as far as I know I can edit the /etc/netdata/netdata.conf to do this, but Im not really sure what to put on the file.

Hope someone can help me or point me at the right direction. Thank you.