NetworkManager won't send DHCPRELEASE
It doesn't appear that NetworkManager will send a DHCPRELEASE in any native way. As a workaorund, I can disable NM built in dhcp client and use dhclient. I can also fake a dhclient leases file and have it send the release.
Can we please get a native way to force NM to send DHCPRELEASE on shutdown or via nmcli command?