[$] Some 6.9 development statistics

The 6.9 kernel was releasedon May12 after a typical nine-week development cycle. Once again,this is a major release containing a lot of changes and new features. Ourmerge-window summaries (part1, part2) covered those changes; now thatthe development cycle is complete, the time has come to look at where allthat work came from - and to introduce a new and experimental LWN featurefor readers interested in this kind of information.