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Add apiserver metric for number of requests dropped by 'max-inflight-requests' filters.
Useful for figuring out on which dimension master is overloaded.
cc @sttts @lavalamp @deads2k @timothysc @hulkholden
Kubernetes-commit: 07ad1f7176e09f0814dba7011596991de2032953
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refactor admission flag
**What this PR does / why we need it**:
Refactor admission control flag, finally make cluster admins not care about orders in this flag.
**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
Add `--enable-admission-plugin` `--disable-admission-plugin` flags and deprecate `--admission-control`.
Afterwards, don't care about the orders specified in the flags.
```
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Use Fatalf instead of Fatal while formatting the output is needed
**What this PR does / why we need it**:
Should use Fatalf instead of Fatal while formatting the output is needed
**Release note**:
NONE
```release-note
```
Kubernetes-commit: 7dadeee5e8b84d41c5249a2ca6a8fb64f48c8e77
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Fix decoding of admission config file
Fixes#584261a552bbe14 (diff-eb9532eb476083e1ab31da9dd6f83eceR41) attempted to use a locally constructed scheme, but the name `scheme` was shadowed by a function arg.
Attempts to run the apiserver with a structured plugin config file would fail to decode (since the passed scheme didn't know about the AdmissionConfiguration type), then fall back to treating the file as a legacy config, and silently continue without correct config
```release-note
kube-apiserver: fixes loading of `--admission-control-config-file` containing AdmissionConfiguration apiserver.k8s.io/v1alpha1 config object
```
Kubernetes-commit: c7526fbb67711c5a36eb957b2e315e0efb815c5b
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update vendor spf13/cobra to enforce required flags
**What this PR does / why we need it**:
spf13/cobra#502 has enforced checking flags that marked as required, an error will be raised if unset.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close that issue when PR gets merged)*:fixes #54855
xref #48400fixeskubernetes/kubectl#121
**Special notes for your reviewer**:
/assign @liggitt @eparis
**Release note**:
```release-note
kubectl now enforces required flags at a more fundamental level
```
Kubernetes-commit: 048757b8a51333f59d3112d2b228d2f0102a4afc
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Support for custom tls cipher suites in api server and kubelet
**What this PR does / why we need it**:
This pull request aims to solve the problem of users not able to set custom cipher suites in the api server.
Several users have requested this given that some default ciphers are vulnerable.
There is a discussion in #41038 of how to implement this. The options are:
- Setting a fixed list of ciphers, but users will have different requirements so a fixed list would be problematic.
- Letting the user set them by parameter, this requires adding a new parameter that could be pretty long with the list of all the ciphers.
I implemented the second option, if the ciphers are not passed by parameter, the Go default ones will be used (same behavior as now).
**Which issue this PR fixes**
fixes#41038
**Special notes for your reviewer**:
The ciphers in Go tls config are constants and the ones passed by parameters are a comma-separated list. I needed to create the `type CipherSuitesFlag` to support that conversion/mapping, because i couldn't find any way to do this type of reflection in Go.
If you think there is another way to implement this, let me know.
If you want to test it out, this is a ciphers combination i tested without the weak ones:
```
TLS_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_RSA_WITH_AES_128_CBC_SHA,TLS_RSA_WITH_AES_256_CBC_SHA,TLS_RSA_WITH_AES_128_GCM_SHA256,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA
```
If this is merged i will implement the same for the Kubelet.
**Release note**:
```release-note
kube-apiserver and kubelet now support customizing TLS ciphers via a `--tls-cipher-suites` flag
```
Kubernetes-commit: b7100f1ee7231617891a100dd34b3490a1f578e4
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Recheck if transformed data is stale when doing live lookup during update
Fixes#49565
Caching storage can pass in a cached object to `GuaranteedUpdate` as a hint for the current object.
If the hint is identical to the data we want to persist, before short-circuiting as a no-op update, we force a live lookup.
We should check two things on the result of that live lookup before short-circuiting as a no-op update:
1. the bytes we want to persist still match the transformed bytes read from etcd
2. the state read from etcd didn't report itself as stale. this would mean the transformer used to read the data would not be the transformer used to write it, and "no-op" writes should still be performed, since transformation will make the underlying content actually different.
After a live lookup, we checked byte equality, but not the stale indicator. This meant that key rotation or encrypted->decrypted, and decrypted->encrypted updates are broken.
Introduced in #54780 and picked back to 1.8 in #55294
```release-note
Fixed encryption key and encryption provider rotation
```
Kubernetes-commit: 4257f7595abbe7299cbbdaaae4fa36559892f654
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remove duplicated import
**Release note**:
```release-note
NONE
```
Kubernetes-commit: 99fb21f61fc0e6c1fffc0d4b5138665806eadce6
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etcd client: add keepalive
**What this PR does / why we need it**: This PR shortens the keepaliveTimeout and enables keepalive within the etcd client to allow the socket to be closed cleanly on a dead etcd server.
**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#46964
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
/cc @xiang90
Kubernetes-commit: 75b2109f23e15bbaac3744f398b1ffd8306adc04
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Add support for submitting/receiving CRD objects as yaml
Fixes#37455
```release-note
Custom resources can now be submitted to and received from the API server in application/yaml format.
```
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remove invalid and useless functions from unit test
**Release note**:
```release-note
NONE
```
Kubernetes-commit: 529bf8308922cdc0ff84ebcfe1ba5beae10f8a0a
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move prometheus register to pkg/endpoints/metrics/metrics.go
**What this PR does / why we need it**:
delete k8s.io/apiserver/pkg/endpoints/apiserver.go
move prometheus init from k8s.io/apiserver/pkg/endpoints/apiserver.go to k8s.io/apiserver/pkg/endpoints/metrics/metrics.go
Since k8s.io/apiserver/pkg/endpoints/apiserver.go only has a metrics init func, which should be in metrics pkg.
**Release note**:
```release-note
NONE
```
/assign @sttts @liggitt
Kubernetes-commit: a6710f3b8751154596ebf29feecd4b90d06ad4bc
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admission: do not leak admission plugin config types outside of the plugin
We had two plugins that did not register their types into the external config scheme, breaking embedded config for them without noticing. Actually though, we do not want to leak those types at all into external scheme, but keep the types internal to the plugins. The second commit in this PR does that.
Kubernetes-commit: 8ae388e9ee9eef1721352ea5003e161893a6c4d9
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periodically flush ResponseWriter when using response compression
This PR fixes API Compression when following logs by ensuring the compression writer periodically flushes (at the end of each write).
This is a commit extracted from #51508 to allow testing of flushing while feature remains disabled / in alpha.
Fixes https://github.com/kubernetes/kubernetes/issues/54205
```release-note
NONE
```
Kubernetes-commit: 32dc50476e6750774da96fa54989098bd0169f03
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added defaults for --watch-cache-sizes description.
**What this PR does / why we need it**:
added defaults for --watch-cache-sizes description to make it clear what the defaults would be when not specified
**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 #
#57105
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Kubernetes-commit: 188e6ebcdbcfd0617dc12e51e8e6a66ce89f3955
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client-go: remove open-api import from types
This builds off of https://github.com/kubernetes/kube-openapi/pull/21 and removes the following imports from `k8s.io/client-go/kubernetes`:
```
github.com/PuerkitoBio/purell
github.com/PuerkitoBio/urlesc
github.com/emicklei/go-restful
github.com/emicklei/go-restful/log
github.com/go-openapi/jsonpointer
github.com/go-openapi/jsonreference
github.com/go-openapi/spec
github.com/go-openapi/swag
github.com/mailru/easyjson/buffer
github.com/mailru/easyjson/jlexer
github.com/mailru/easyjson/jwriter
golang.org/x/text/cases
golang.org/x/text/internal
golang.org/x/text/internal/tag
golang.org/x/text/language
golang.org/x/text/runes
golang.org/x/text/secure/precis
golang.org/x/text/width
k8s.io/kube-openapi/pkg/common
```
/assign @sttts
/assign @mbohlool
cc @kubernetes/sig-api-machinery-pr-reviews
```release-note
NONE
```
Kubernetes-commit: f6d0632bbbf8428bfec0ca72db5103916e6248b4
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add admission into RecommendedOptions
**What this PR does / why we need it**:
make admission part of the RecommendedOptions
**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#56627
**Special notes for your reviewer**:
**Release note**:
```release-note
NONE
```
Kubernetes-commit: 67a5a266739b3dacb5d6920eaa1373d62f5e1a75
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client-go: remove import of github.com/gregjones/httpcache
Moves NewCacheRoundTripper from `k8s.io/client-go/transport` to its own package. This prevents Kubernetes clients from requiring its dependencies.
This change removes the following transitive imports from `k8s.io/client-go/kubernetes`
```
github.com/google/btree
github.com/gregjones/httpcache
github.com/gregjones/httpcache/diskcache
github.com/peterbourgon/diskv
```
```release-note
NONE
```
Kubernetes-commit: 4a77bd53e88a719c612086df69a52899bbdd85af
fisherxu
Cao Shufeng
hzxuzhonghu
Jordan Liggitt
Kubernetes Publisher
Eric Chiang
David Eads
Marek Grabowski
Nikhita Raghunath
Yu Liao
ilackarms
Chao Xu
Dr. Stefan Schimanski