Hacking on *traffic*

Repos used:

<https://github.com/envoyproxy/go-control-plane>
:   implements control plane, has testing stuff in pkg/test/main (iirc).

<https://github.com/grpc/grpc-go/tree/master/xds/internal/client>
:   implements client for xDS - can probably list all code out from there.

To see if things are working start the testing control plane from go-control-plane:

https://github.com/envoyproxy/envoy/blob/master/api/API_OVERVIEW.md

https://github.com/envoyproxy/learnenvoy/blob/master/_articles/service-discovery.md


Cluster: A cluster is a group of logically similar endpoints that Envoy connects to. In v2, RDS
routes points to clusters, CDS provides cluster configuration and Envoy discovers the cluster
members via EDS.