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kubectl scale: support Unstructured objects

Support `Unstructured` objects with kubectl scale.

So that we can use the scale subresource for custom resources (possible after https://github.com/kubernetes/kubernetes/pull/55168 is merged):

```
➜ cluster/kubectl.sh scale --replicas=5 crontabs/my-new-cron-object
crontab "my-new-cron-object" scaled
```

**Release note**:

```release-note
NONE
```

/cc sttts deads2k p0lyn0mial

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Set shared PID namespace mode based on PodSpec

**What this PR does / why we need it**: This PR enables pod process namespace sharing as an alpha feature, as described in [Shared PID Namespace Proposal](https://github.com/kubernetes/community/blob/master/contributors/design-proposals/node/pod-pid-namespace.md).

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
WIP #1615

**Special notes for your reviewer**:
/assign @dchen1107 

**Release note**:

```release-note
When the `PodShareProcessNamespace` alpha feature is enabled, setting `pod.Spec.ShareProcessNamespace` to `true` will cause a single process namespace to be shared between all containers in a pod.
```

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components pprof profiling make use of existing genericapiserver's

**What this PR does / why we need it**:

fix #60278

Instead of writing private pprof, all components make use of generic apiserver existing profiling.

**Release note**:

```release-note
NONE
```

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add spelling checking script

**What this PR does / why we need it**:
Add spell checking script to avoid involving any typos.

Currently many small PRs are fixing those annoying typos, which is time-consuming and low efficient. We should add such a preflight check before a PR gets merged.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:
/sig testing
/area test-infra
/sig release
/cc @ixdy
/assign @liggitt @smarterclayton 
 
**Release note**:

```release-note
add spelling checking script
```

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Add external metric type to HPA API

**What this PR does / why we need it**:
Add external metric type to HPA API proposed in xref https://github.com/kubernetes/community/pull/1801

**Release note**:
```release-note
Allows HorizontalPodAutoscaler to use global metrics not associated with any Kubernetes object (for example metrics from a hoster service running outside of Kubernetes cluster).
```

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Use SeekStart, SeekCurrent, and SeekEnd repalace of deprecated constant

**What this PR does / why we need it**:
Use SeekStart, SeekCurrent, and SeekEnd repalace of deprecated constant.
'''
// Deprecated: Use io.SeekStart, io.SeekCurrent, and io.SeekEnd.
const (
	SEEK_SET int = 0 // seek relative to the origin of the file
	SEEK_CUR int = 1 // seek relative to the current offset
	SEEK_END int = 2 // seek relative to the end
)

'''
**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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fix race condition issue when detaching azure disk

**What this PR does / why we need it**:
add lock before detaching azure disk, without this PR, there would be lots of `Multi-Attach error` when scheduling one pod from one node to another.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60101

**Special notes for your reviewer**:
@feiskyer @djsly @khenidak 
Since we are using `getLunMutex.LockKey(instanceid)` for both AttachDisk and DetachDisk, there would be only one VM.update operation at a time for both AttachDisk and DetachDisk.

**Release note**:

```
fix race condition issue when detaching azure disk
```

/assign @feiskyer 
Could you also mark as v1.10 milestone @feiskyer thanks.
/sig azure

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kubectl create job

**What this PR does / why we need it**:
This add `kubectl create job` command, and is a followup to #60039. 

**Special notes for your reviewer**:

**Release note**:
```release-note
Add kubectl create job command
```

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Remove factory metricsclient method

**What this PR does / why we need it**:
Alternative approach to https://github.com/kubernetes/kubernetes/pull/60142 which fixed the `NewCmdTopPod` return arguments

/assign @deads2k 

**Release note**:
```release-note
None
```

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Remove ClientSetForVersion & ClientConfigForVersion from factory

**What this PR does / why we need it**:
This is further cleaning the factory.

**Special notes for your reviewer**:
/assign @deads2k 

**Release note**:
```release-note
NONE
```

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Improve etcd-version-monitor etcd 3.0-3.1 compatibility

In etcd-version-monitor, this remove grpc labels used only in etcd 3.1+ format when translating metric back to 3.0 format

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Add CRI container log rotation support

Fixes https://github.com/kubernetes/kubernetes/issues/58823.

This PR:
1) Added `pkg/kubelet/logs/container_log_manager.go` which manages and rotates container logs.
2) Added a feature gate `CRIContainerLogRotation` to enable the alpha feature. And 2 kubelet flags `--container-log-max-size` and `--container-log-max-files` to configure the rotation behavior.
3) Added unit test and node e2e test for container log rotation.

Note that:
1) Container log manager only starts when the container runtime is `remote` (not docker), because we can't implement `ReopenContainerLog` for docker.
2) Rotated logs are compressed with `gzip`.
2) The latest rotated log is not compressed. Because fluentd may still be reading the file right after rotation.
3) `kubectl logs` still doesn't support log rotation. This is not a regression anyway, it doesn't support log rotation for docker log today. We'll probably fix this in the future. (Issue: https://github.com/kubernetes/kubernetes/issues/59902)

An example of container log directory with `--container-log-max-files=3`:
```console
$ ls -al /var/log/pods/57146449-11ec-11e8-90e1-42010af00002
total 592
drwxr-xr-x 2 root root   4096 Feb 15 01:07 .
drwxr-xr-x 3 root root  12288 Feb 15 01:06 ..
-rw-r----- 1 root root 176870 Feb 15 01:07 log-container_0.log
-rw-r--r-- 1 root root  40239 Feb 15 01:07 log-container_0.log.20180215-010737.gz
-rw-r----- 1 root root 365996 Feb 15 01:07 log-container_0.log.20180215-010747
```

/assign @mtaufen for the config change.
/assign @dashpole @crassirostris for the log change.
/assign @feiskyer for CRI related change.
/cc @yujuhong @feiskyer @abhi @mikebrow @mrunalp @runcom 
/cc @kubernetes/sig-node-pr-reviews @kubernetes/sig-instrumentation-pr-reviews 

**Release note**:

```release-note
[Alpha] Kubelet now supports container log rotation for container runtime which implements CRI(container runtime interface).
The feature can be enabled with feature gate `CRIContainerLogRotation`.
The flags `--container-log-max-size` and `--container-log-max-files` can be used to configure the rotation behavior.
```

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Make CSI volume attributes first class

**What this PR does / why we need it**:
Move CSI volume attributes from PV annotation to CSI volume source first class field

**Release note**:
```release-note
NONE
```

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Fix compilation of nsenter code on Mac

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staging: add boilerplate header

Follow up of https://github.com/kubernetes/kubernetes/pull/57656.

Adds boilerplate in the relevant staging repos so that they don't need to depend on code-generator's boilerplate.

**Release note**:

```release-note
NONE
```

/cc sttts fisherxu

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 Migrate FeatureGates type of kube-proxy from string to map[string]bool

**What this PR does / why we need it**:
Migration of FeatureGates type. This is a follow-up of #53025.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
ref: #53025
https://github.com/kubernetes/kubernetes/pull/57754#discussion_r160023416

**Special notes for your reviewer**:
/cc @luxas @mtaufen @ncdc 

**Release note**:

```release-note
action required: kube-proxy: feature gates are now specified as a map when provided via a JSON or YAML KubeProxyConfiguration, rather than as a string of key-value pairs.
```

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Split KUBE-SERVICES chain to re-shrink the INPUT chain

**What this PR does / why we need it**:
#43972 added an iptables rule "`-A INPUT -j KUBE-SERVICES`" to make NodePort ICMP rejection work. (Previously the KUBE-SERVICES chain was only run from OUTPUT, not INPUT.) #44547 extended that patch for ExternalIP rejection as well.

However, the KUBE-SERVICES chain may potentially have a very large number of ICMP reject rules for plain ClusterIP services (the ones that get run from OUTPUT), and it seems that for some reason the kernel is much more sensitive to the length of the INPUT chain than it is to the length of the OUTPUT chain. So a node that worked fine with kube 1.6 (when KUBE-SERVICES was only run from OUTPUT) might fall over with kube 1.7 (with KUBE-SERVICES being run from both INPUT and OUTPUT).

(Specifically, a node with about 5000 ClusterIP reject rules that ran fine with OpenShift 3.6 [kube 1.6] slowed almost to a complete halt with OpenShift 3.7 [kube 1.7].)

This PR fixes things by splitting out the "new" part of KUBE-SERVICES (NodePort and ExternalIP reject rules) into a separate KUBE-EXTERNAL-SERVICES chain run from INPUT, and moves KUBE-SERVICES back to being only run from OUTPUT. (So, yes, this assumes that you don't have 5000 NodePort/ExternalIP services, but, if you do, there's not much we can do, since those rules *have* to be run on the INPUT side.)

Oh, and I left in the code to clean up the "`-A INPUT -j KUBE-SERVICES`" rule even though we don't generate it any more, so it gets fixed on upgrade.

**Release note**:
```release-note
Reorganized iptables rules to fix a performance regression on clusters with thousands of services.
```

@kubernetes/sig-network-bugs @kubernetes/rh-networking

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StorageOS configurable device directory and mount options

**What this PR does / why we need it**:
This allows StorageOS volumes to be mounted when the kubelet is running in a container and we are unable to use the default device location (/var/lib/storageos/volumes).  With this PR, the node's device location is requested via the StorageOS api, falling back to the current behaviour if not configured.  The node's device location can be supplied as an environment variable (DEVICE_DIR) to the StorageOS container.  This is backwards-compatible and no changes are needed to existing deployments.

The PR also allows Mount options to be set for StorageOS volumes in the same way they're enabled for other volume plugins.

The StorageOS API dependency was updated to the latest version, but no functionality changes besides adding the DeviceDir property to the Controller object.

There is also a small refactor of the loopback device handling code in storageos_utils.go to capture stderr output.

**Release note**:
```release-note
StorageOS volume plugin updated to support mount options and environments where the kubelet runs in a container and the device location should be specified.
```

Not sure why godep changed the comments of unrelated packages in Godeps.json...

/sig storage

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Fix kubectl describe output for priority class objects.

**What this PR does / why we need it**:

Fixes `kubectl describe priorityclass`  (try https://kubernetes.io/docs/concepts/configuration/pod-priority-preemption/#example-priorityclass)  

```
Name:           high-priority
Value:          %!s(int32=1000000)
GlobalDefault:  %!s(bool=false)
Description:    This priority class should be used for XYZ service pods only.
Annotations:    <none>
Events:         <none>

```

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #

**Special notes for your reviewer**:

**Release note**:

```release-note
None
```

@bsalamat @kubernetes/sig-scheduling-bugs  @kubernetes/sig-cli-bugs 
/king bug
/sig scheduling
/sig cli

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examples/podsecuritypolicy: add owners

When we modify something PSP-related, we need to update examples as well but unfortunately they wasn't belong to us.

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Introduce e2e test for Stackdriver Metadata Agent

**What this PR does / why we need it**:
Introduce e2e test for Stackdriver Metadata Agent

**Release note**:
```release-note
None
```

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Use consts as predicate key names in handlers

**What this PR does / why we need it**:

Per discussion in: https://github.com/kubernetes/kubernetes/pull/59335/files#r168351460

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #59951

**Special notes for your reviewer**:

**Release note**:

```release-note
Use consts as predicate name in handlers
```

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apiextensions: add subresources for custom resources

Fixes #38113
Fixes #58778

**Related**:
- Proposal: https://github.com/kubernetes/community/pull/913
- For custom resources to work with `kubectl scale`: https://github.com/kubernetes/kubernetes/pull/58283

**Add types**:

- Add `CustomResourceSubResources` type to CRD.
    - Fix proto generation for `CustomResourceSubResourceStatus`: https://github.com/kubernetes/kubernetes/pull/55970.
- Add feature gate for `CustomResourceSubResources`.
    - Update CRD strategy: if feature gate is disabled, this feature is dropped (i.e. set to `nil`).
- Add validation for `CustomResourceSubResources`:
    - `SpecReplicasPath` should not be empty and should be a valid json path under `.spec`. If there is no value under the given path in the CustomResource, the `/scale` subresource will return an error on GET.
    - `StatusReplicasPath` should not be empty and should be a valid json path under `.status`. If there is no value under the given path in the CustomResource, the status replica value in the /scale subresource will default to 0.
    - If present, `LabelSelectorPath` should be a valid json path. If there is no value under `LabelSelectorPath` in the CustomResource, the status label selector value in the `/scale` subresource will default to the empty string.
    - `ScaleGroupVersion` should be `autoscaling/v1`.
    - If `CustomResourceSubResources` is enabled, only `properties` is allowed under the root schema for CRD validation.

**Add status and scale subresources**:

- Use helper functions from `apimachinery/pkg/apis/meta/v1/unstructured/helpers.go`.
    - Improve error handling: https://github.com/kubernetes/kubernetes/pull/56563, https://github.com/kubernetes/kubernetes/pull/58215.
- Introduce Registry interface for storage.
- Update storage:
    - Introduce `CustomResourceStorage` which acts as storage for the custom resource and its status and scale subresources. Note: storage for status and scale is only enabled when the feature gate is enabled _and_ the respective fields are enabled in the CRD.
    - Introduce `StatusREST` and its `New()`, `Get()` and `Update()` methods.
    - Introduce `ScaleREST` and its `New()`, `Get()` and `Update()` methods.
        - Get and Update use the json paths from the CRD and use it to return an `autoscaling/v1.Scale` object.
- Update strategy:
    - In `PrepareForCreate`,
         - Clear `.status`.
         - Set `.metadata.generation` = 1
    - In `PrepareForUpdate`,
         - Do not update `.status`.
             - If both the old and new objects have `.status` and it is changed, set it back to its old value.
             - If the old object has a `.status` but the new object doesn't, set it to the old value.
             - If old object did not have a `.status` but the new object does, delete it.
         - Increment generation if spec changes i.e. in the following cases:
             - If both the old and new objects had `.spec` and it changed.
             - If the old object did not have `.spec` but the new object does.
             - If the old object had a `.spec` but the new object doesn't.
     - In `Validate` and `ValidateUpdate`,
        - ensure that values at `specReplicasPath` and `statusReplicasPath` are >=0 and < maxInt32.
        - make sure there are no errors in getting the value at all the paths.
    - Introduce `statusStrategy` with its methods.
        - In `PrepareForUpdate`:
            - Do not update `.spec`.
                - If both the old and new objects have `.spec` and it is changed, set it back to its old value.
                - If the old object has a `.spec` but the new object doesn't, set it to the old value.
                - If old object did not have a `.spec` but the new object does, delete it.
             - Do not update `.metadata`.
        - In `ValidateStatusUpdate`:
            - For CRD validation, validate only under `.status`.
            - Validate value at `statusReplicasPath` as above. If `labelSelectorPath` is a path under `.status`, then validate it as well.
- Plug into the custom resource handler:
    - Store all three storage - customResource, status and scale in `crdInfo`.
    - Use the storage as per the subresource in the request.
    - Use the validator as per the subresource (for status, only use the schema for `status`, if present).
    - Serve the endpoint as per the subresource - see `serveResource`, `serveStatus` and `serveScale`.
- Update discovery by adding the `/status` and `/scale` resources, if enabled.

**Add tests**:

- Add unit tests in `etcd_test.go`.
- Add integration tests.
    - In `subresources_test.go`, use the [polymporphic scale client](https://github.com/kubernetes/kubernetes/tree/master/staging/src/k8s.io/client-go/scale) to get and update `Scale`.
    -  Add a test to check everything works fine with yaml in `yaml_test.go`.

**Release note**:

```release-note
`/status` and `/scale` subresources are added for custom resources.
```

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Return information about which int tests failed in the summary - followup

@stevekuznetsov you asked about it in https://github.com/kubernetes/kubernetes/pull/59486#discussion_r169351176

/assign @stevekuznetsov 


**Release note**:
```release-note
NONE
```

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Cleanup node type checking for azure nodes

**What this PR does / why we need it**:

This PR cleanup node type checking for azure nodes. It also fixes a problem of `instance not found` error for VMAS nodes in vmss cluster (vmType set to vmss):

```
ss.GetPrimaryInterface(k8s-master), ss.getCachedVirtualMachine(k8s-master), err=instance not found
```

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #60185

**Special notes for your reviewer**:

**Release note**:

```release-note
NONE
```

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Conversion from typed to unstructured should set GVK

**What this PR does / why we need it**:
By convention typed objects do not have `TypeMeta` information filled. When the scheme converts a typed object into Unstructured it should set type meta information explicitly otherwise Unstructured object is not recognizable.

**Special notes for your reviewer**:
Bug was not visible to tests because tests were working with a typed object with `TypeMeta` information filled. It was filled by previous tests. I have refactored tests for better isolation. Also fixed some other issues in tests.

Add `?w=1` to the PR's URL to see the diff with whitespace changes ignored.

**Release note**:
```release-note
NONE
```
/kind bug
/sig api-machinery
/cc @smarterclayton @deads2k

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Bump addon-manager to v8.6

**What this PR does / why we need it**:
Follow up of https://github.com/kubernetes/kubernetes/pull/59378, build & push a new addon-manager image to pick up the namespace change to support istio addon.

Pushed images for {amd64, arm, arm64, ppc64le, s390x}.

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #NONE 

**Special notes for your reviewer**:
/assign @mikedanese @ostromart 

**Release note**:

```release-note
NONE
```