Release notes for kOps 1.23 series

⚠ kOps 1.23 has not been released yet! ⚠

This is a document to gather the release notes prior to the release.

Significant changes

Support for Kubernetes version 1.18 is deprecated and will be removed in kOps 1.24.
Support for Kubernetes version 1.19 is deprecated and will be removed in kOps 1.25.
Support for CentOS 7 is deprecated and will be removed in future versions of kOps.
Support for CentOS 8 is deprecated and will be removed in future versions of kOps.
Support for Debian 9 (Stretch) is deprecated and will be removed in future versions of kOps.
Support for RHEL 7 is deprecated and will be removed in future versions of kOps.
Support for Ubuntu 18.04 (Bionic) is deprecated and will be removed in future versions of kOps.
All legacy addons are deprecated in favor of managed addons, including the metrics server addon and the autoscaler addon.
The node-role.kubernetes.io/master and kubernetes.io/role labels are deprecated and might be removed from control plane nodes in future versions of kOps.
Due to lack of maintainers, the Aliyun/Alibaba Cloud support has been deprecated. The current implementation will be left as-is until the implementation needs updates or otherwise becomes incompatible. At that point, it will be removed. We very much welcome anyone willing to contribute to this cloud provider.
Due to lack of maintainers, the CloudFormation support has been deprecated. The current implementation will be left as-is until the implementation needs updates or otherwise becomes incompatible. At that point, it will be removed. We very much welcome anyone willing to contribute to this target.