Was digging through a project at work today where some guy in 2014 made 100+ commits in a single day and the only one that had a comment said "upgrading to v4.0".
Yep, this is the convention. Unfortunately, I've never been able to enforce it. Encouraging good git commit messages is probably the bottom of the things I can coach. I'd be happy if commits were properly squashed/rebased and that we all followed the same PR merge strategy.