### 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

          "format": "time_series",
          "intervalFactor": 1,
          "refId": "A",
          "step": 4
        }
      ],
      "title": "Server Request Volume",
      "type": "stat"
    },
    {
      "datasource": {
        "type": "prometheus",
        "uid": "${datasource}"
      },
      "fieldConfig": {
        "defaults": {

                                  Valid Options: CLIENT_AND_SERVER, CLIENT, SERVER
                                enum:
                                - CLIENT_AND_SERVER
                                - CLIENT
                                - SERVER
                                type: string

name: ISTIO_NAMESPACE value: | {{ .Values.global.istioNamespace }} command: - sh - "-c" - |- NODE_ID="sidecar~${INSTANCE_IP}~${POD_NAME}.${POD_NAMESPACE}~cluster.local" SERVER_URI="dns:///istiod.${ISTIO_NAMESPACE}.svc:15010" echo ' { "xds_servers": [ { "server_uri": "'${SERVER_URI}'", "channel_creds": [{"type": "insecure"}], "server_features" : ["xds_v3"] } ], "node": { "id": "'${NODE_ID}'", "metadata": { "GENERATOR": "grpc" } } }' > /var/lib/grpc/data/bootstrap.json containers: {{- range $index, $container...

			// If the cniListener exits, at least we should record an error log
			log.Errorf("CNI listener server exiting unexpectedly: %v", err)
		}
	}()

	context.AfterFunc(s.ctx, func() {
		if err := s.cniListenServer.Close(); err != nil {
			log.Errorf("CNI listen server terminated with error: %v", err)
		} else {
			log.Debug("CNI listen server terminated")
		}
	})
	return nil
}

option go_package = "k8s.io/api/apiserverinternal/v1alpha1";

// An API server instance reports the version it can decode and the version it
// encodes objects to when persisting objects in the backend.
message ServerStorageVersion {
  // The ID of the reporting API server.
  optional string apiServerID = 1;

  // The API server encodes the object to this version when persisting it in
  // the backend (e.g., etcd).

}

func setupHTTPServer() (*httptest.Server, *url.URL) {
	handler := http.NewServeMux()
	handler.HandleFunc("/scopej/ads", adsHandler)
	handler.HandleFunc("/scopej/resource", resourceHandler)
	server := httptest.NewServer(handler)
	url, _ := url.Parse(server.URL)
	return server, url
}

func Test_flagState_run(t *testing.T) {
	server, url := setupHTTPServer()
	defer server.Close()

  optional int64 observedGeneration = 1;

  // DisruptedPods contains information about pods whose eviction was
  // processed by the API server eviction subresource handler but has not
  // yet been observed by the PodDisruptionBudget controller.
  // A pod will be in this map from the time when the API server processed the
  // eviction request to the time when the pod is seen by PDB controller

	CertDir string

	// Timeout is how long to wait before giving up on XDS
	Timeout time.Duration

	// InsecureSkipVerify skips client verification the server's certificate chain and host name.
	InsecureSkipVerify bool

	// XDSSAN is the expected Subject Alternative Name of the XDS server
	XDSSAN string

	// Plaintext forces plain text communication (for talking to port 15010)
	Plaintext bool

  // versions the Webhook expects. API server will try to use first version in
  // the list which it supports. If none of the versions specified in this list
  // supported by API server, validation will fail for this object.
  // If a persisted webhook configuration specifies allowed versions and does not
  // include any versions known to the API Server, calls to the webhook will fail
  // and be subject to the failure policy.