git notes — annotate commits without touching their SHA

git-notes.sh

# git notes — attach metadata to commits without rewriting history
# Notes live in refs/notes/commits — the commit SHA never changes.

git notes add -m "Deployed to prod at 14:32 UTC, PLAT-482" HEAD

git notes show HEAD

# See notes inline in git log:
git log --show-notes --oneline -10

# Append to an existing note:
git notes append -m "Rollback window closes 16:00 UTC." HEAD

# Notes don't push by default — explicit push/fetch required:
git push origin refs/notes/commits
git fetch origin refs/notes/commits

# Great for CI/CD: attach build results to a commit without touching its hash.