### What happened?

`EphemeralContainerStatuses` is not normalized in 	`normalizeStatus()` in the status manager:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L1026-L1043

This does not seem to cause any user facing problem because `EphemeralContainerStatuses` is sorted before passed to the status manager and timestamps are normalized at marshaling to create a patch:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/kubelet_pods.go#L2336

https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L873

However, an unexpected behavior is caused internally because timestamps are not normalized. If the log verbosity is 3 or larger, the following messages are logged periodically in kubelet when an ephemeral container exists:

```
May 14 20:10:33 kind-control-plane kubelet[720]: I0514 20:10:33.437155 	720 status_manager.go:230] "Syncing all statuses"
May 14 20:10:33 kind-control-plane kubelet[720]: I0514 20:10:33.438512 	720 status_manager.go:984] "Pod status is inconsistent with cached status for pod, a reconciliation should be triggered" pod="default/ephemeral-demo" statusDiff=<
May 14 20:10:33 kind-control-plane kubelet[720]:     	  &v1.PodStatus{
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	... // 8 identical fields
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	PodIPs:            	{{IP: "10.244.0.5"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	StartTime:         	s"2024-05-14 20:09:21 +0000 UTC",
May 14 20:10:33 kind-control-plane kubelet[720]:     	-     	InitContainerStatuses: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	+     	InitContainerStatuses: []v1.ContainerStatus{},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	ContainerStatuses: 	{{Name: "ephemeral-demo", State: {Running: &{StartedAt: {Time: s"2024-05-14 20:09:23 +0000 UTC"}}}, Ready: true, Image: "registry.k8s.io/pause:3.1", ...}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	QOSClass:          	"BestEffort",
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	EphemeralContainerStatuses: []v1.ContainerStatus{
May 14 20:10:33 kind-control-plane kubelet[720]:     	              	{
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	Name: "debugger-qk87g",
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	State: v1.ContainerState{
May 14 20:10:33 kind-control-plane kubelet[720]:     	                              	Waiting:	nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	-                             	Running:	&v1.ContainerStateRunning{StartedAt: v1.Time{Time: s"2024-05-14 20:09:35 +0000 UTC"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	+                             	Running:	&v1.ContainerStateRunning{StartedAt: v1.Time{Time: s"2024-05-14 20:09:35.697513091 +0000 UTC"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                              	Terminated: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	LastTerminationState: {},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	Ready:            	false,
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	... // 7 identical fields
May 14 20:10:33 kind-control-plane kubelet[720]:     	              	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	Resize:            	"",
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	ResourceClaimStatuses: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	  }
May 14 20:10:33 kind-control-plane kubelet[720]:  >

```

This message is emitted here:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L984-L988

After `needsReconcile()` returns `true`, `syncPod()` is called. This does not look so harmful because `unchaged` gets `true` eventually:

https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L873-L881

API is called once unnecessarily in `syncPod()`, though:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L843


### What did you expect to happen?

It might be better to normalize ephemeral container statuses, at least timestamps, in the status manager to avoid this unexpected behavior.


### How can we reproduce it (as minimally and precisely as possible)?

Set the log verbosity of kubelet to 3 or larger. Then, create an ephemeral container like [this](https://kubernetes.io/docs/tasks/debug/debug-application/debug-running-pod/#ephemeral-container-example).

### Anything else we need to know?

_No response_

### Kubernetes version

<details>

```console
$ kubectl version
# paste output here
Client Version: v1.29.4
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.29.2
```
</details>


### Cloud provider

<details>
None
</details>


### OS version

<details>

```console
# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here
```

</details>


### Install tools

<details>

</details>


### Container runtime (CRI) and version (if applicable)

<details>

</details>


### Related plugins (CNI, CSI, ...) and versions (if applicable)

<details>

</details>

Status manager does not normalize ephemeral container statuses
This is a GitHub Issue
repo:kubernetes
owner:kubernetes
Title : Status manager does not normalize ephemeral container statuses
Issue date:

--- start body ---
### What happened?

`EphemeralContainerStatuses` is not normalized in 	`normalizeStatus()` in the status manager:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L1026-L1043

This does not seem to cause any user facing problem because `EphemeralContainerStatuses` is sorted before passed to the status manager and timestamps are normalized at marshaling to create a patch:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/kubelet_pods.go#L2336

https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L873

However, an unexpected behavior is caused internally because timestamps are not normalized. If the log verbosity is 3 or larger, the following messages are logged periodically in kubelet when an ephemeral container exists:

```
May 14 20:10:33 kind-control-plane kubelet[720]: I0514 20:10:33.437155 	720 status_manager.go:230] "Syncing all statuses"
May 14 20:10:33 kind-control-plane kubelet[720]: I0514 20:10:33.438512 	720 status_manager.go:984] "Pod status is inconsistent with cached status for pod, a reconciliation should be triggered" pod="default/ephemeral-demo" statusDiff=<
May 14 20:10:33 kind-control-plane kubelet[720]:     	  &v1.PodStatus{
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	... // 8 identical fields
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	PodIPs:            	{{IP: "10.244.0.5"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	StartTime:         	s"2024-05-14 20:09:21 +0000 UTC",
May 14 20:10:33 kind-control-plane kubelet[720]:     	-     	InitContainerStatuses: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	+     	InitContainerStatuses: []v1.ContainerStatus{},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	ContainerStatuses: 	{{Name: "ephemeral-demo", State: {Running: &{StartedAt: {Time: s"2024-05-14 20:09:23 +0000 UTC"}}}, Ready: true, Image: "registry.k8s.io/pause:3.1", ...}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	QOSClass:          	"BestEffort",
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	EphemeralContainerStatuses: []v1.ContainerStatus{
May 14 20:10:33 kind-control-plane kubelet[720]:     	              	{
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	Name: "debugger-qk87g",
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	State: v1.ContainerState{
May 14 20:10:33 kind-control-plane kubelet[720]:     	                              	Waiting:	nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	-                             	Running:	&v1.ContainerStateRunning{StartedAt: v1.Time{Time: s"2024-05-14 20:09:35 +0000 UTC"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	+                             	Running:	&v1.ContainerStateRunning{StartedAt: v1.Time{Time: s"2024-05-14 20:09:35.697513091 +0000 UTC"}},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                              	Terminated: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	LastTerminationState: {},
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	Ready:            	false,
May 14 20:10:33 kind-control-plane kubelet[720]:     	                      	... // 7 identical fields
May 14 20:10:33 kind-control-plane kubelet[720]:     	              	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	},
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	Resize:            	"",
May 14 20:10:33 kind-control-plane kubelet[720]:     	      	ResourceClaimStatuses: nil,
May 14 20:10:33 kind-control-plane kubelet[720]:     	  }
May 14 20:10:33 kind-control-plane kubelet[720]:  >

```

This message is emitted here:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L984-L988

After `needsReconcile()` returns `true`, `syncPod()` is called. This does not look so harmful because `unchaged` gets `true` eventually:

https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L873-L881

API is called once unnecessarily in `syncPod()`, though:
https://github.com/kubernetes/kubernetes/blob/cade1dddd81eba338df85de7b5d17324a87243b5/pkg/kubelet/status/status_manager.go#L843


### What did you expect to happen?

It might be better to normalize ephemeral container statuses, at least timestamps, in the status manager to avoid this unexpected behavior.


### How can we reproduce it (as minimally and precisely as possible)?

Set the log verbosity of kubelet to 3 or larger. Then, create an ephemeral container like [this](https://kubernetes.io/docs/tasks/debug/debug-application/debug-running-pod/#ephemeral-container-example).

### Anything else we need to know?

_No response_

### Kubernetes version

<details>

```console
$ kubectl version
# paste output here
Client Version: v1.29.4
Kustomize Version: v5.0.4-0.20230601165947-6ce0bf390ce3
Server Version: v1.29.2
```
</details>


### Cloud provider

<details>
None
</details>


### OS version

<details>

```console
# On Linux:
$ cat /etc/os-release
# paste output here
$ uname -a
# paste output here

# On Windows:
C:\> wmic os get Caption, Version, BuildNumber, OSArchitecture
# paste output here
```

</details>


### Install tools

<details>

</details>


### Container runtime (CRI) and version (if applicable)

<details>

</details>


### Related plugins (CNI, CSI, ...) and versions (if applicable)

<details>

</details>

--- end body ---

None