The existing method is to meter outgoing traffic from the entire VM
to a specific "remote_ip_addr"(in case of outbound),
but the method I suggested can meter outgoing traffic
from a particular subnet to external network.
From a metering point of view,
it does not matter which address/CIDR is the destination for outbound.
But, it is important to know where(subnet or VM) the packet leaves from.
That way you can see how much VMs are using the external network.
For outbound metering, dst is 0.0.0.0/0 and src is network of VMs
and for inbound metering, src is 0.0.0.0/0 and dst is network of VMs.
When creating a meter-label-rule, it is correct
to specify src address for "remote_ip_prefix" option for outbound
and specify dst address for inbound.
If you are confused by the term "remote_ip_prefix",
you need to clarify this option.
Change-Id: Ia3f3e26410a73d7b44abae637703fda41c4bc09a
Closes-Bug: #1716913
(cherry picked from commit 92db1d4a2c)
a01780203b