Project: mesos
Issue MESOS-5647: Expose a statistics endpoint on the `network/cni` isolator.
We need a statistics endpoint in the `network/cni` isolator to expose metrics relating to a containers network traffic. On receiving a request for a given container the `network/cni` isolator could use NETLINK system calls to query the kernel for interface and routing statistics for a given container's network namespace.
Story points: 5