We are hosting some parachain full nodes on the cloud. However we found that 80% of the costs come from the internet traffic, and specifically, we found that the outbound traffic of the relaychain client has been skyrocketing. We noticed that it's possible to limit
--out-peers in substrate, but even a few peers can still create huge traffic (e.g. new client downloading the blocks).
Is it possible to limit the outbound traffic bandwidth rate in Substrate?