## Urgent Upgrade Notes 

### (No, really, you MUST read this before you upgrade)

- Expand scheduler priority functions and scheduling framework plugins' node score range to [0, 100]. Note: this change is internal and does not affect extender and RequestedToCapacityRatio custom priority, which are still expected to provide a [0, 10] range. ([#83522](https://github.com/kubernetes/kubernetes/pull/83522), [@draveness](https://g...

parameter in kube-proxy is misleading, no port is opened with this address. Instead it is translated internally to "nodeIP". The nodeIPs for both families are now taken from the Node object if `--bind-address` is unspecified or set to the "any" address (0.0.0.0 or ::). It is recommended to leave `--bind-address` unspecified, and in particular avoid to set it to localhost (127.0.0.1 or ::1) ([#119525](https://github.com/kubernetes/kubernetes/pull/119525), [@uablrek](https://github.com/uablrek)) [SIG Network...

- The kubelet, when using `--cloud-provider=external` can use the `--node-ip` flag with one of the unspecified addresses 0.0.0.0 or ::, to create the Node with the IP of the default gateway of the corresponding IP family and then delegating the responsibility to the external cloud provider. This solves the bootstrap problems of out of tree cloud providers that are deployed...

- Add --permit-address-sharing flag to `kube-apiserver` to listen with `SO_REUSEADDR`. While allowing to listen on wildcard IPs like 0.0.0.0 and specific IPs in parallel, it avoids waiting for the kernel to release socket in `TIME_WAIT` state, and hence, considerably reducing `kube-apiserver` restart times under certain conditions. ([#93861](https://github.com/kubernetes/kubernetes/pull/93861),...

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- Apiserver will now reject connection attempts to `0.0.0.0/::` when handling a proxy subresource request. ([#107402](https://github.com/kubernetes/kubernetes/pull/107402), [@anguslees](https://github.com/anguslees))

* Add RequestedToCapacityRatioPriority priority function. Function is parametrized with set of points mapping node utilization (0-100) to score (0-10). ([#63929](https://github.com/kubernetes/kubernetes/pull/63929), [@losipiuk](https://github.com/losipiuk))

* kubeadm: Create /var/lib/etcd with correct permissions (0700) by default. ([#71885](https://github.com/kubernetes/kubernetes/pull/71885), [@dims](https://github.com/dims))