- In "large" clusters, kube-proxy in iptables mode will now sometimes
  leave unused rules in iptables for a while (up to `--iptables-sync-period`)
  before deleting them. This improves performance by not requiring it to
  check for stale rules on every sync. (In smaller clusters, it will still
  remove unused rules immediately once they are no longer used.)

* kubeadm will no longer generate an unused etcd CA and certificates when configured to use an external etcd cluster. ([#63806](https://github.com/kubernetes/kubernetes/pull/63806), [@detiber](https://github.com/detiber))

- Kube-apiserver: the unused `--master-service-namespace` flag was deprecated and will be removed in v1.27. ([#112797](https://github.com/kubernetes/kubernetes/pull/112797), [@SataQiu](https://github.com/SataQiu))

* Update defaultbackend to v1.5 ([#69334](https://github.com/kubernetes/kubernetes/pull/69334), [@bowei](https://github.com/bowei))
* Remove unused chaosclient. ([#68409](https://github.com/kubernetes/kubernetes/pull/68409), [@wgliang](https://github.com/wgliang))

- Make EBS volume expansion faster ([#66728](https://github.com/kubernetes/kubernetes/pull/66728), [@gnufied](https://github.com/gnufied))
- Remove unused binary and container image for kube-aggregator. The functionality is already integrated into the kube-apiserver. ([#67157](https://github.com/kubernetes/kubernetes/pull/67157), [@dims](https://github.com/dims))

- Added `ImageMaximumGCAge` field to Kubelet configuration, which allows a user to set the maximum age an image is unused before it's garbage collected. ([#121275](https://github.com/kubernetes/kubernetes/pull/121275), [@haircommander](https://github.com/haircommander))

  - scheduler_e2e_scheduling_duration_seconds replaced by scheduler_scheduling_attempt_duration_seconds ([#115209](https://github.com/kubernetes/kubernetes/pull/115209), [@dgrisonnet](https://github.com/dgrisonnet))
- Removed unused rule for `nodes/spec` from `ClusterRole` `system:kubelet-api-admin` ([#113267](https://github.com/kubernetes/kubernetes/pull/113267), [@hoskeri](https://github.com/hoskeri))

- Fixed an issue where eviction manager was not deleting unused images or containers. ([#127874](https://github.com/kubernetes/kubernetes/pull/127874), [@AnishShah](https://github.com/AnishShah))

	c1 = iota  // c1 == 1
	c2 = iota  // c2 == 2
)

const (
	a = 1 << iota  // a == 1  (iota == 0)
	b = 1 << iota  // b == 2  (iota == 1)
	c = 3          // c == 3  (iota == 2, unused)
	d = 1 << iota  // d == 8  (iota == 3)
)

const (
	u         = iota * 42  // u == 0     (untyped integer constant)
	v float64 = iota * 42  // v == 42.0  (float64 constant)

* kubeadm will no longer generate an unused etcd CA and certificates when configured to use an external etcd cluster. ([#63806](https://github.com/kubernetes/kubernetes/pull/63806), [@detiber](https://github.com/detiber))