With this PR, the second call to `Acquire()` will block unless the lock is released (process exits).
Also removed the memory mutex in the previous code since we don't need `Release()` here so no need to save and protect the local fd.

Fix #42929.

Automatic merge from submit-queue (batch tested with PRs 38805, 42362, 42862)

Let GC print specific message for RESTMapping failure

Make the error messages reported in https://github.com/kubernetes/kubernetes/issues/39816 to be more specific, also only print the message once.

I'll also update the garbage collector's doc to clearly state we don't support tpr yet.

We'll wait for the watchable discovery feature (@sttts are you going to work on that?) to land in 1.7, and then enable the garbage collector to handle TPR.

cc @hongchaodeng @MikaelCluseau @djMax

Automatic merge from submit-queue (batch tested with PRs 38805, 42362, 42862)

Fix deployment generator after introducing deployments in apps/v1beta1

This PR does two things:

1. Switches all generator to produce versioned objects, to bypass the problem of having an object in multiple versions, which then results in not having stable generator (iow. producing exactly the same object).
2. Introduces new generator for `apps/v1beta1` deployments.

@kargakis @janetkuo ptal

@kubernetes/sig-apps-pr-reviews @kubernetes/sig-cli-pr-reviews ptal

This is a followup to https://github.com/kubernetes/kubernetes/pull/39683, so I'm adding 1.6 milestone.

```release-note
Introduce new generator for apps/v1beta1 deployments
```

Automatic merge from submit-queue

add err info to authorize in psp

It's unwise to ignore the err in my view.

Automatic merge from submit-queue (batch tested with PRs 42608, 42444)

Return nil when deleting non-exist GCE PD

When gce cloud tries to delete a disk, if the disk could not be found
from the zones, the function should return nil error. This modified behavior is also consistent with AWS

Automatic merge from submit-queue (batch tested with PRs 42608, 42444)

fix typo in know-flags

ref to https://github.com/kubernetes/kubernetes/pull/41417

Automatic merge from submit-queue (batch tested with PRs 42877, 42853)

discriminate more when parsing kube-env :(

Exactly match the key. Right now CA_KEY matches ETCD_CA_KEY and we just pick the first because fml.

I HATE BASH

more fixes for kubelet rbac enablement upgrades.

Automatic merge from submit-queue (batch tested with PRs 42877, 42853)

Remove unused functions and make logs slightly better

Zero risk cleanup, removing function that are not used anymore, and adding few more logs to help debugging problems.

cc @aveshagarwal

Automatic merge from submit-queue (batch tested with PRs 36704, 42719)

Extend timeouts in taints test to account for slow Pod deletions

Fix #42685

Before merging this we need a consensus on what to do with slow Pod deletions.

Automatic merge from submit-queue

Use Prometheus instrumentation conventions

The `System` and `Subsystem` parameters are subject to removal.
(x-ref: https://github.com/prometheus/client_golang/issues/240)

All metrics should use base units, which is seconds in the duration
case.

Counters should always end in `_total` and metrics should avoid
referring to potential label dimensions. Those should rather be
mentioned in the documentation string.

@kubernetes/sig-instrumentation 

Reference docs:
https://prometheus.io/docs/practices/instrumentation/
https://prometheus.io/docs/practices/naming/

**Release note**:
```
Breaking change: Renamed REST client Prometheus metrics to follow the instrumentation conventions ("request_latency_microseconds" -> "rest_client_request_latency_seconds", "request_status_codes" -> "rest_client_requests_total"). Please update your alerting pipeline if you rely on them. 
```

Automatic merge from submit-queue

e2e test: Log container output on TestContainerOutput error

When a pod started with TestContainerOutput or TestContainerOutputRegexp
fails from unknown reason, we should log all output of all its containers
so we can analyze what went wrong.

This would help us to see what wrong in https://github.com/kubernetes/kubernetes/issues/40811 - a container is running there for 3 minutes and dies and we want to see what it did for these 3 minutes.

```release-note
NONE
```

Automatic merge from submit-queue

[Federation] Fix removing kube-dns configmap during cluster unjoin

Fixes: #42836 

cc @madhusudancs @kubernetes/sig-federation-bugs

Automatic merge from submit-queue

Add new DaemonSetStatus to kubectl printer and describer

@kargakis @lukaszo @kubernetes/sig-apps-pr-reviews @kubernetes/sig-cli-pr-reviews 

```release-note
Add new DaemonSet status fields to kubectl printer and describer. 
```

When a pod started with TestContainerOutput or TestContainerOutputRegexp
fails from unknown reason, we should log all output of all its containers
so we can analyze what went wrong.

Automatic merge from submit-queue

[Federation] Prevent trailing periods in kube-dns federations domains

kubefed-level fix to catch cases where FEDERATIONS_DOMAIN_MAP is not set in the environment (i.e. CI).

Addresses https://github.com/kubernetes/kubernetes/issues/42809

A histogram allows to aggregate by labels and calculate more
comprehensive quantiles.

The `System` and `Subsystem` parameters are subject to removal.
(x-ref: https://github.com/prometheus/client_golang/issues/240)

All metrics should use base units, which is seconds in the duration
case.

Counters should always end in `_total` and metrics should avoid
referring to potential label dimensions. Those should rather be
mentioned in the documentation string.

Automatic merge from submit-queue (batch tested with PRs 42811, 42859)

Change the junit file name format to `junit_image-name_id.xml`,

With this, the junit file name will be `junit_image-name_id.xml:
```
junit_containervm_id.xml
junit_coreos-alpha_id.xml
junit_gci_id.xml
junit_ubuntu-docker10_id.xml
junit_ubuntu-docker12_id.xml
```

The test infra team will use the `image-name` inside the junit file name and replace the original `[1] [2] [3] ..` with the actual image name.

This will make it a little bit easier for debugging.

/cc @dchen1107 @krzyzacy @kubernetes/sig-node-pr-reviews 
/cc @kubernetes/release-maintainers This is a minor test only change to make it easier to debug issues.

Automatic merge from submit-queue (batch tested with PRs 42811, 42859)

 Validation PVs for mount options

We are going to move the validation in its own package and we will be calling validation for individual volume types as needed.

Fixes https://github.com/kubernetes/kubernetes/issues/42573

and make the gci image name shorter.

Automatic merge from submit-queue (batch tested with PRs 42024, 42780, 42808, 42640)

kubectl: respect DaemonSet strategy parameters for rollout status

It handles "after-merge" comments from #41116

cc @kargakis @janetkuo 

I will add one more e2e test later. I need to handle some in company stuff.

Automatic merge from submit-queue (batch tested with PRs 42024, 42780, 42808, 42640)

Node controller test flake 39975 with delay for try function

**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #39975 

/cc @ncdc @gmarek @liggitt

Automatic merge from submit-queue (batch tested with PRs 42024, 42780, 42808, 42640)

Handle NPD during cluster upgrade.

Generate NPD token during upgrade.

I could not fully verify this change because of https://github.com/kubernetes/kubernetes/issues/42199. However, at least I tried upgrade master, and the corresponding environment variables are correctly generated.
```
...
ENABLE_NODE_PROBLEM_DETECTOR: 'standalone'
...
KUBELET_TOKEN: 'PKNgAaVXeL3VojND2s0KMleELjzGK0oW'
```

@maisem @dchen1107

Automatic merge from submit-queue

Remove VCenterPort from vsphere cloud provider.

**What this PR does / why we need it**:
Address a bug inside vsphere cloud provider when a port number other than 443 is specified inside the config file.
The url which is used for communicating with govmomi should not include port number.
A port number other than 443 will result in 404 error.
VCenterPort stays in VSphereConfig structure for backward compatibility.

**Which issue this PR fixes** : fixes https://github.com/kubernetes/kubernetes-anywhere/issues/338

I HATE BASH

We are going to move the validation in its own package
and we will be calling validation for individual volume types
as needed.

Automatic merge from submit-queue (batch tested with PRs 42734, 42745, 42758, 42814, 42694)

Dropped docker 1.9.x support. Changed the minimumDockerAPIVersion to

1.22

cc/ @Random-Liu @yujuhong 

We talked about dropping docker 1.9.x support for a while. I just realized that we haven't really done it yet. 

```release-note
Dropped the support for docker 1.9.x and the belows. 
```

Automatic merge from submit-queue (batch tested with PRs 42734, 42745, 42758, 42814, 42694)

kubemark: enable CRI in the hollow kubelet

Automatic merge from submit-queue (batch tested with PRs 42734, 42745, 42758, 42814, 42694)

Implement automated downgrade testing.

Node version cannot be higher than the master version, so we must
switch the node version first. Also, we must use the upgrade script
from the appropriate version for GCE.

Automatic merge from submit-queue (batch tested with PRs 42734, 42745, 42758, 42814, 42694)

Bump glbc version to 0.9.2

Follow up to https://github.com/kubernetes/ingress/pull/384

Automatic merge from submit-queue (batch tested with PRs 42734, 42745, 42758, 42814, 42694)

Create DefaultPodDeletionTimeout for e2e tests

In our e2e and e2e_node tests, we had a number of different timeouts for deletion.
Recent changes to the way deletion works (#41644, #41456) have resulted in some timeouts in e2e tests.  #42661 was the most recent fix for this.
Most of these tests are not meant to test pod deletion latency, but rather just to clean up pods after a test is finished.
For this reason, we should change all these tests to use a standard, fairly high timeout for deletion.

cc @vishh @Random-Liu