- UpdateContainerResources is no longer recorded as a `container_status` operation. It now uses the label `update_container`. ([#75278](https://github.com/kubernetes/kubernetes/pull/75278), [@Nessex](https://github.com/Nessex))

- Removed "endpoint-controller" and "workload-leader-election" FlowSchemas from the default APF configuration.
  

* Use separate client for leader election in scheduler to avoid starving leader election by regular scheduler operations. ([#53793](https://github.com/kubernetes/kubernetes/pull/53793), [@wojtek-t](https://github.com/wojtek-t))

- Kubernetes components that perform leader election now only support using `Leases` for this. ([#114055](https://github.com/kubernetes/kubernetes/pull/114055), [@aimuz](https://github.com/aimuz))

- Added an option to enable leader election in local-up-cluster.sh via the LEADER_ELECT CLI flag. ([#127786](https://github.com/kubernetes/kubernetes/pull/127786), [@Jefftree](https://github.com/Jefftree))

* kube-scheduler: restores default leader election behavior. leader-elect command line parameter should "true" ([#60524](https://github.com/kubernetes/kubernetes/pull/60524), [@dims](https://github.com/dims))

- Client-go: Optimized leaders renewing leases by updating leader lock optimistically without getting the record from the API server first. Also, a new metric `leader_election_slowpath_total` was added to allow users to monitor how many leader elections are updated non-optimistically.

- The `v1` version of `LeaderMigrationConfiguration` supports only `leases` API for leader election. To use formerly supported mechanisms, please continue using `v1beta1`. ([#108016](https://github.com/kubernetes/kubernetes/pull/108016), [@jiahuif](https://github.com/jiahuif))

focused on stability and performance improvements in the 1.13 release.  A new alpha feature is introduced to improve the mechanism that nodes heartbeat back to the control plane.  The `NodeLease` feature results in the node using a `Lease` resource in the `kube-node-lease` namespace that is renewed periodically.  The `NodeStatus` that was used previously to heartbeat back to the control plane is only updated when it changes.  This reduces load on the control plane for large clusters. The Kubelet plugin...

* Fix metrics API group name in audit configuration ([#53493](https://github.com/kubernetes/kubernetes/pull/53493), [@piosz](https://github.com/piosz))
* Use separate client for leader election in scheduler to avoid starving leader election by regular scheduler operations. ([#53793](https://github.com/kubernetes/kubernetes/pull/53793), [@wojtek-t](https://github.com/wojtek-t))