Moving to monorepos without losing history
No need to start from scratch; you can merge your repos and preserve history.
If you'd like to merge two (or more) git repositories together and preserve the commit histories of both, here's the script for you:
cd some-repo
git remote add other-repo git@other-repo.com:other-repo/other-repo.git
git fetch other-repo
git checkout other-repo/master
git checkout -b merge-other-repo
mkdir other-repo
for f in *; do
git mv $f other-repo
done
# If you're making a merge request:
git merge master --allow-unrelated-histories
git push origin merge-other-repo
# Then make a merge request
# If you're pushing directly to master:
git checkout master
git merge merge-other-repo
git push origin master