MUST read this before you upgrade)

- Added the ability to reduce both the initial delay and the maximum delay accrued between container restarts for a node for containers in `CrashLoopBackOff` across the cluster to the recommended values of `1s` initial delay and `60s` maximum delay. To set this for a node, turn on the feature gate `ReduceDefaultCrashLoopBackOffDecay`. If you are also using the feature gate `KubeletCrashLoopBackOffMax` with a configured per-node `CrashLoopBackOff.MaxContainerRestartPeriod`,...

backoff delay accrued between container restarts for a node for containers in `CrashLoopBackOff`. To set this for a node, turn on the feature gate `KubeletCrashLoopBackoffMax` and set the `CrashLoopBackOff.MaxContainerRestartPeriod ` field between `"1s"` and `"300s"` in your [kubelet config file](https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/). ([#128374](https://github.com/kubernetes/kubernetes/pull/128374), [@lauralorenz](https://github.com/lauralorenz)) [SIG API Machinery...