/** The key of the configuration. e.g. false */
    String CRAWLER_IGNORE_ROBOTS_TXT = "crawler.ignore.robots.txt";

    /** The key of the configuration. e.g. false */
    String CRAWLER_IGNORE_ROBOTS_TAGS = "crawler.ignore.robots.tags";

    /** The key of the configuration. e.g. true */
    String CRAWLER_IGNORE_CONTENT_EXCEPTION = "crawler.ignore.content.exception";

    /** The key of the configuration. e.g. 404 */

- Fix winkernel kube-proxy to only use dual stack when host and networking supports it (#101047, @jsturtevant) [SIG Network and Windows]
- Fix: ignore not a VMSS error for VMAS nodes in EnsureBackendPoolDeleted. (#105402, @ialidzhikov) [SIG Cloud Provider]
- Fix: ignore the case when updating Azure tags (#104686, @nilo19) [SIG Cloud Provider]

- Ignore `not a vmss instance` error for VMAS nodes in `EnsureBackendPoolDeleted`. ([#105185](https://github.com/kubernetes/kubernetes/pull/105185), [@ialidzhikov](https://github.com/ialidzhikov))
- Ignore the case when comparing azure tags in service annotation. ([#104705](https://github.com/kubernetes/kubernetes/pull/104705), [@nilo19](https://github.com/nilo19))

* New kubeadm flag `--ignore-preflight-errors` that enables to decrease severity of each individual error to warning. ([#56072](https://github.com/kubernetes/kubernetes/pull/56072), [@kad](https://github.com/kad))
    * Old flag `--skip-preflight-checks` is marked as deprecated and acts as `--ignore-preflight-errors=all`

  // - Honor: nodes without taints, along with tainted nodes for which the incoming pod
  // has a toleration, are included.
  // - Ignore: node taints are ignored. All nodes are included.
  //
  // If this value is nil, the behavior is equivalent to the Ignore policy.
  // This is a beta-level feature default enabled by the NodeInclusionPolicyInPodTopologySpread feature flag.
  // +optional

- Fix: consolidate logs for instance not found error (#105364, @nilo19) [SIG Cloud Provider]
- Fix: ignore not a VMSS error for VMAS nodes in EnsureBackendPoolDeleted. (#105404, @ialidzhikov) [SIG Cloud Provider]
- Fix: ignore the case when updating Azure tags (#104687, @nilo19) [SIG Cloud Provider]

    Node Allocatable. This will result in a reduction of schedulable capacity in
    clusters post upgrade where kubelet hard eviction has been turned on for
    memory. To opt-out set `--experimental-allocatable-ignore-eviction=true`.
  * More details on these feature here:
    https://kubernetes.io/docs/tasks/administer-cluster/reserve-compute-resources/
* Drop the support for docker 1.9.x. Docker versions 1.10.3, 1.11.2, 1.12.6

### **Other notable changes**

#### Admission plugin
* OwnerReferencesPermissionEnforcement admission plugin ignores pods/status. ([#45747](https://github.com/kubernetes/kubernetes/pull/45747), [@derekwaynecarr](https://github.com/derekwaynecarr))


* Ignored mirror pods in PodPreset admission plugin. ([#45958](https://github.com/kubernetes/kubernetes/pull/45958), [@k82cn](https://github.com/k82cn))

- Kube-controller-manager: increased the global level for broadcaster's logging to 3 so that users can ignore event messages by lowering the logging level. It reduces information noise. ([#122293](https://github.com/kubernetes/kubernetes/pull/122293), [@mengjiao-liu](https://github.com/mengjiao-liu))

* Fix clustered datastore name to be absolute. ([#54438](https://github.com/kubernetes/kubernetes/pull/54438), [@pshahzeb](https://github.com/pshahzeb))
* Fix `kubeadm upgrade plan` for offline operation: ignore errors when trying to fetch latest versions from dl.k8s.io ([#54016](https://github.com/kubernetes/kubernetes/pull/54016), [@praseodym](https://github.com/praseodym))