The Linux Kernel statistics are no longer shown by Openhub. Please fix it.
Someone has added additional repositories again. IMHO only these two repos are relevant:
For git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git master I would just create an extra project by OpenHub as linux-stable.git provides the same commits, that are spread over multiple branches.
Openhub still does not show the Linux kernel contributions: