// We currently support several kinds of IPAM allocators (these are denoted by
// the CIDRAllocatorType):
//   - RangeAllocator is an allocator that assigns PodCIDRs to nodes and works
//     in conjunction with the RouteController to configure the network to get
//     connectivity.
//   - CloudAllocator is an allocator that synchronizes PodCIDRs from IP
//     ranges assignments from the underlying cloud platform.

	if err != nil {
		return nil, false, err
	}

	routeController := routecontroller.New(routes,
		controllerContext.ClientBuilder.ClientOrDie("route-controller"),
		controllerContext.InformerFactory.Core().V1().Nodes(),
		controllerContext.ComponentConfig.KubeCloudShared.ClusterName,
		clusterCIDRs)

    reason: FrequentDockerRestart
    status: "False"
    type: FrequentDockerRestart
  - lastHeartbeatTime: "2019-07-09T16:17:47Z"
    lastTransitionTime: "2019-07-09T16:17:47Z"
    message: RouteController created a route
    reason: RouteCreated
    status: "False"
    type: NetworkUnavailable
  - lastHeartbeatTime: "2019-09-20T19:32:50Z"
    lastTransitionTime: "2019-07-09T16:17:29Z"

    reason: FrequentDockerRestart
    status: "False"
    type: FrequentDockerRestart
  - lastHeartbeatTime: "2019-07-09T16:17:47Z"
    lastTransitionTime: "2019-07-09T16:17:47Z"
    message: RouteController created a route
    reason: RouteCreated
    status: "False"
    type: NetworkUnavailable
  - lastHeartbeatTime: "2019-09-20T19:32:50Z"
    lastTransitionTime: "2019-07-09T16:17:29Z"

* Add dnsmasq as a DNS cache in kube-dns pod ([#26114](https://github.com/kubernetes/kubernetes/pull/26114), [@ArtfulCoder](https://github.com/ArtfulCoder))
* routecontroller: Add wait.NonSlidingUntil, use it ([#26301](https://github.com/kubernetes/kubernetes/pull/26301), [@zmerlynn](https://github.com/zmerlynn))

        protected BuildCacheController getDelegate() {
            BuildCacheController rootController = this.rootController.getDelegate();
            if (rootController != NoOpBuildCacheController.INSTANCE) {
                // The root controller is available, so don't use the build specific controller
                return rootController;
            }
            return delegate.get();
        }

        @Override

* kubeadm: Fix join preflight check false negative ([#49825](https://github.com/kubernetes/kubernetes/pull/49825), [@erhudy](https://github.com/erhudy))
* route_controller will emit "FailedToCreateRoute" event when fails to create route. ([#49821](https://github.com/kubernetes/kubernetes/pull/49821), [@MrHohn](https://github.com/MrHohn))