- Client-go now exposes two new metrics to monitor the client-go logic that
  generate http.Transports for the clients.
  
  - `rest_client_transport_cache_entries` is a gauge metric
  with the number of existing entries in the internal cache
  
  - `rest_client_transport_create_calls_total` is a counter
  that increments each time a new transport is created, storing
  the result of the operation needed to generate it: hit, miss

- proxy/transport now supports Content-Encoding: deflate ([#76551](https://github.com/kubernetes/kubernetes/pull/76551), [@JieJhih](https://github.com/JieJhih))

- Adds the ability to pass --strict-transport-security-directives to the kube-apiserver to set the HSTS header appropriately.  Be sure you understand the consequences to browsers before setting this field. ([#96502](https://github.com/kubernetes/kubernetes/pull/96502), [@249043822](https://...

([#62695](https://github.com/kubernetes/kubernetes/pull/62695), [@CaoShuFeng](https://github.com/CaoShuFeng))

  // iqn is Target iSCSI Qualified Name.
  optional string iqn = 2;

  // lun is iSCSI Target Lun number.
  optional int32 lun = 3;

  // iscsiInterface is the interface Name that uses an iSCSI transport.
  // Defaults to 'default' (tcp).
  // +optional
  optional string iscsiInterface = 4;

  // fsType is the filesystem type of the volume that you want to mount.

pkg net/http, method (*Transport) Clone() *Transport
pkg net/http, type Server struct, BaseContext func(net.Listener) context.Context
pkg net/http, type Server struct, ConnContext func(context.Context, net.Conn) context.Context
pkg net/http, type Transport struct, ForceAttemptHTTP2 bool
pkg net/http, type Transport struct, ReadBufferSize int
pkg net/http, type Transport struct, WriteBufferSize int

*   The canonical pronunciation of kubectl is "cube control".
*   Added --raw to kubectl create to POST using the normal transport. ([#54245](https://github.com/kubernetes/kubernetes/pull/54245),[ @deads2k](https://github.com/deads2k))

pkg net, type Dialer struct, DualStack //deprecated
pkg net/http, method (*Transport) CancelRequest //deprecated
pkg net/http, type CloseNotifier //deprecated
pkg net/http, type ProtocolError //deprecated
pkg net/http, type Request struct, Cancel //deprecated
pkg net/http, type Transport struct, Dial //deprecated
pkg net/http, type Transport struct, DialTLS //deprecated
pkg net/http, var ErrHeaderTooLong //deprecated

- Rename unschedulableQ to unschedulablePods ([#108919](https://github.com/kubernetes/kubernetes/pull/108919), [@denkensk](https://github.com/denkensk))
- SPDY transport in client-go will no longer follow redirects. ([#108531](https://github.com/kubernetes/kubernetes/pull/108531), [@tallclair](https://github.com/tallclair))

`(*"k8s.io/client-go/rest".Request).{Do,DoRaw,Stream,Watch}` now require callers to pass a `context.Context` as an argument. The context is used for timeout and cancellation signaling and to pass supplementary information to round trippers in the wrapped transport chain. If you don't need any of this functionality, it is sufficient to pass a context created with `context.Background()` to these functions. The `(*"k8s.io/client-go/rest".Request).Context` method is removed now that all methods that execute a...