return nil, fmt.Errorf("failed to find pod %v", ns)
	}
	if util.PodRedirectionEnabled(ns, pod) {
		return pod, nil
	}
	return nil, nil
}

func (s *InformerHandlers) Start() {
	kube.WaitForCacheSync("informer", s.ctx.Done(), s.pods.HasSynced, s.namespaces.HasSynced)
	go s.queue.Run(s.ctx.Done())
}

// Gets a point-in-time snapshot of all pods that are CURRENTLY ambient enabled
// (as per control plane annotation)

* Proper syncing and shutdown logic. Checking for when an informer has fully started can be quite tricky; `kclient` automatically handles it.

Under the `kclient` package, `clienttest` also provides similar interfaces meant for writing unit tests.

*All Istio informer usage should use this library and not operate on Kubernetes informers directly.*

**`krt`** is a very high level wrapper around Kubernetes informers, building on top of `kclient`.

#### CRD Watcher

For watches against custom types (CRDs), we want to gracefully handle missing CRDs. Naively starting informers against the missing types would result in errors and blocking startup. Instead, we introduce a "CRD Watcher" component that watches the CRDs in the cluster to determine if they are available or not.

This is consumed in two ways:

- Kube-proxy initialization waits for all pre-sync events from node and serviceCIDR informers to be delivered. ([#126561](https://github.com/kubernetes/kubernetes/pull/126561), [@wedaly](https://github.com/wedaly)) [SIG Network]

   ([#123520](https://github.com/kubernetes/kubernetes/pull/123520), [@haircommander](https://github.com/haircommander))
- Informers now supports adding Indexers after the informer starts.
   ([#117046](https://github.com/kubernetes/kubernetes/pull/117046), [@howardjohn](https://github.com/howardjohn))
- Printed more information when `kubectl describe` a `VolumeAttributesClass`.

- Removed scheduler names from preemption event messages. ([#114980](https://github.com/kubernetes/kubernetes/pull/114980), [@mimowo](https://github.com/mimowo))

  a bug in the transforming informer during the Resync operation, 
  by making the transforming function idempotent. ([#124352](https://github.com/kubernetes/kubernetes/pull/124352), [@wojtek-t](https://github.com/wojtek-t)) [SIG API Machinery and Scheduling]

- The maximum length of the `CSINode` id field has increased to 256 bytes to match the CSI spec. ([#104160](https://github.com/kubernetes/kubernetes/pull/104160), [@pacoxu](https://github.com/pacoxu))
- Troubleshooting: informers log handlers that take more than 100 milliseconds to process an object if the `DeltaFIFO` queue starts to grow beyond 10 elements. ([#103917](https://github.com/kubernetes/kubernetes/pull/103917), [@aojea](https://github.com/aojea))

- The kubeconfig is now exposed in `the kube-scheduler` framework handle. Out-of-tree plugins can leverage that to build CRD informers easily. ([#100644](https://github.com/kubernetes/kubernetes/pull/100644), [@Huang-Wei](https://github.com/Huang-Wei))

- Fixed a race condition between `Run()` and `SetTransform()` and `SetWatchErrorHandler()` in shared informers. ([#117870](https://github.com/kubernetes/kubernetes/pull/117870), [@howardjohn](https://github.com/howardjohn)) [SIG API Machinery]