Rebase merge backend

Dear Git community,
Since git rebase was moved to merge backend I can’t find the way how
to get information that branch was fast-forwarded or it was up-to-date
(it was provided by the apply backend). And a similar issue: I can’t
get information about commits skipped during rebase because they
became empty. Using apply backend I could check that because `No
changes — did you forget to use ‘git add’ ` line was printed. Can you
please help with these issues? Are there any ways to get such info?

Thank you!
Nikolay Rykunov
Software Developer in VCS
JetBrains
http://www.jetbrains.com
The Drive to Develop