Seems 'Documentation/githooks.txt' needs an update related to this change. Previously it said(note the **s) that 'commit-msg' is invoked only by 'git commit',
commit-msg
This hook is invoked by git commit**, and can be bypassed with the
--no-verify option. It takes a single parameter, the name of the file
that holds the proposed commit log message. Exiting with a non-zero
status causes the git commit** to abort.
---
Kaartic
