- The JWT authenticator configuration set via the `--authentication-config` flag is now dynamically reloaded as the file changes on disk. ([#123525](https://github.com/kubernetes/kubernetes/pull/123525), [@enj](https://github.com/enj))

- Applied resources from a directory containing kustomization.yaml ([#74140](https://github.com/kubernetes/kubernetes/pull/74140), [@Liujingfang1](https://github.com/Liujingfang1))

- Added the `SizeBasedListCostEstimate` feature gate (enabled by default), which changes how APF seats are assigned to `LIST` requests. With this feature, one seat is assigned per 100KB of data loaded into memory at once during a `LIST` operation. ([#132932](https://github.com/kubernetes/kubernetes/pull/132932), [@serathius](https://github.com/serathius))

* Performance test framework and basic tests for the IPAM controller, to simulate behavior of the four supported modes under lightly loaded and loaded conditions, where load is defined as the number of operations to perform as against the configured kubernetes. ([#61143](https://github.com/kubernetes/kubernetes/pull/61143), [@satyasm](https://github.com/satyasm))

- Kubeadm now prints warnings instead of throwing errors if the current system time is outside of the NotBefore and NotAfter bounds of a loaded certificate.  ([#94504](https://github.com/kubernetes/kubernetes/pull/94504), [@neolit123](https://github.com/neolit123))

- CA, certificate and key bundles for the `generic-apiserver` based servers will be reloaded immediately after the files are changed. ([#104102](https://github.com/kubernetes/kubernetes/pull/104102), [@tnqn](https://github.com/tnqn))

* Container runtime daemon (e.g. dockerd) logs in GCE cluster will be uploaded to stackdriver and elasticsearch with tag `container-runtime`. ([#59103](https://github.com/kubernetes/kubernetes/pull/59103), [@Random-Liu](https://github.com/Random-Liu))

- Reduce API server memory when many CRDs are loaded by sharing a single etcd3 client logger across all clients ([#111648](https://github.com/kubernetes/kubernetes/pull/111648), [@negz](https://github.com/negz)) [SIG API Machinery]

- A new API server flag `--encryption-provider-config-automatic-reload` was added to control when the encryption config should be automatically reloaded without needing to restart the server.  All KMS plugins are now merged into a single healthz check at `/healthz/kms-providers` when reload is enabled, or when only KMS v2 plugins are used. ([#113529](https://github.com/kubernetes/kubernetes/pull/113529),...

- kubeadm: fix "certificate-authority" files not being pre-loaded when using file discovery ([#80966](https://github.com/kubernetes/kubernetes/pull/80966), [@neolit123](https://github.com/neolit123))