Leap Micro 5.5 availability and Leap Micro 5.3 EOL

A new version of the modern lightweight host operating system Leap Micro 5.5 is now available. All documents including Release notes from SLE Micro 5.5 documentation space are also applicable for Leap Micro, as Leap Micro is essentially a rebranded SLE Micro.

This is a companion discussion topic for the original entry at https://news.opensuse.org/2023/10/12/leap-micro-55-hands-on/