summary says mostly all.

I upgraded jenkins from 1.424.1 to 1.424.2.
then I upgraded plugins (among which the git plugin)

after upgrading the git plugin from 1.1.14 to 1.1.15, all succesfull builds from git repositories seem not to be seen:
for those projects the last succes column only contains N/A, but the last failure column does contain the expected (kind of) info
(I already downgraded to 1.1.14 and did not check whether the build numbers shown in the last failure column were correct)

I noticed this as non-logged-in user – I don't recall whether being logged in or not makes a difference, I think it didn't.

downgrading to 1.1.14 showed again the correct info on the dashboard.