Comment 1 for bug 2011783

Are you wanting to disable cloud-init from configuring the network entirely? If so, that can be done following these instructions:
https://cloudinit.readthedocs.io/en/latest/reference/network-config.html#disabling-network-configuration

Otherwise, you're essentially asking to have cloud-init partially configure the network, but ignore the parts you want to keep separate. Can you explain the use case for such a setup?

Also, please attach the resulting tarball from "cloud-init collects-logs".