"cluster": "outbound|9080||productpage.default.svc.cluster.local",
                      "timeout": "0s",
                      "retry_policy": {
                        "retry_on": "connect-failure,refused-stream,unavailable,cancelled,retriable-status-codes",
                        "num_retries": 2,
                        "retry_host_predicate": [
                          {

  //   matches /foo/bar/baz, but does not match /foo/barbaz).
  // * ImplementationSpecific: Interpretation of the Path matching is up to
  //   the IngressClass. Implementations can treat this as a separate PathType
  //   or treat it identically to Prefix or Exact path types.
  // Implementations are required to support all path types.
  // Defaults to ImplementationSpecific.
  optional string pathType = 3;

			if !useKube {
				err := sa.AddDefaultResources()
				if err != nil {
					return err
				}
			}

			// If files are provided, treat them (collectively) as a source.
			parseErrors := 0
			if len(readers) > 0 {
				if err = sa.AddReaderKubeSource(readers); err != nil {
					fmt.Fprintf(cmd.ErrOrStderr(), "Error(s) adding files: %v", err)

### Config Serving

Config serving is the layer that actually accepts proxy clients, connected over bidirectional gRPC streams, and serve them the required configuration.

We will have two triggers for sending config - requests and pushes.

#### Requests

  //   matches /foo/bar/baz, but does not match /foo/barbaz).
  // * ImplementationSpecific: Interpretation of the Path matching is up to
  //   the IngressClass. Implementations can treat this as a separate PathType
  //   or treat it identically to Prefix or Exact path types.
  // Implementations are required to support all path types.
  // Defaults to ImplementationSpecific.
  optional string pathType = 3;