MySQL 8.0 Release Notes
MySQL 8.0 Source Code Documentation
Changes in NDB Cluster releases are documented separately from this reference manual; you can find release notes for the changes in each NDB Cluster 8.0 release at NDB 8.0 Release Notes, and for each NDB Cluster 7.6 release at NDB 7.6 Release Notes.
You can obtain release notes for older versions of NDB Cluster from NDB Cluster Release Notes.