case isSysErrInvalidArg(err):
			st, _ := Lstat(filePath)
			if st != nil && st.IsDir() {
				// Linux returns InvalidArg for directory O_DIRECT
				// we need to keep this fallback code to return correct
				// errors upwards.
				return nil, dmTime, errFileNotFound
			}
			return nil, dmTime, errUnsupportedDisk
		}
		return nil, dmTime, err
	}
	defer f.Close()

* Remove the restart-kube-proxy and restart-apiserver functions ([#23180](https://github.com/kubernetes/kubernetes/pull/23180), [@roberthbailey](https://github.com/roberthbailey))
* Copy annotations back from RS to Deployment on rollback ([#23160](https://github.com/kubernetes/kubernetes/pull/23160), [@janetkuo](https://github.com/janetkuo))

* Restored the ability of kubectl running inside a pod to consume resource files specifying a different namespace than the one the pod is...

            }
            result.put(key, value);
          }
        } catch (UnsupportedLoadingOperationException e) {
          // loadAll not implemented, fallback to load
          for (K key : keysToLoad) {
            misses--; // get will count this miss
            result.put(key, get(key, defaultLoader));
          }
        }
      }

- Kubeadm: support automatic retry after failing to pull image ([#86899](https://github.com/kubernetes/kubernetes/pull/86899), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]
- Kubeadm: upgrade supports fallback to the nearest known etcd version if an unknown k8s version is passed ([#88373](https://github.com/kubernetes/kubernetes/pull/88373), [@SataQiu](https://github.com/SataQiu)) [SIG Cluster Lifecycle]

- The fallback behavior of the Downward API's `resourceFieldRef` field was updated to account for pod-level resources: if container-level limits were not set, pod-level limits were now used before falling back to node allocatable resources. ([#132605](https://...

$return: append($return, $value);\n    }\n  }\n  @return $return;\n}\n\n// scss-docs-start border-radius-mixins\n@mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {\n  @if $enable-rounded {\n    border-radius: valid-radius($radius);\n  }\n  @else if $fallback-border-radius != false {\n    border-radius: $fallback-border-radius;\n  }\n}\n\n@mixin border-top-radius($radius: $border-radius) {\n  @if $enable-rounded {\n    border-top-left-radius: valid-radius($radius);\n  ...

* Fix scheduler crashes when Prioritize Map function returns error. ([#69618](https://github.com/kubernetes/kubernetes/pull/69618), [@DylanBLE](https://github.com/DylanBLE))
* Add fallbacks to ARM API when getting empty node IP from Azure IMDS ([#69077](https://github.com/kubernetes/kubernetes/pull/69077), [@feiskyer](https://github.com/feiskyer))

  - Better detection of installed CRI.
  - Better output for image pull errors.
- Improved air-gapped and offline support
  - kubeadm now handles air-gapped environments by using the local client version as a fallback.
  - Some kubeadm commands are now allowed to work in a completely offline mode.
- Certificate handling improvements:
  - Renew certs as part of upgrade.

- Fallback from OpenAPI V3 to V2 when the OpenAPI V3 document is invalid or incomplete. ([#117980](https://github.com/kubernetes/kubernetes/pull/117980), [@seans3](https://github.com/seans3)) [SIG CLI]