I can't say they are good, because my commit messages get technical, and because I'm not very good at git, but here is my process.

My project is in early stages and I am primary developer. I only have several instances I am supporting.

I upgrade by doing a git checkout and ./rebuild.pl.

Whenever the value of current git pointer changes, it automatically generates a changelog of all the commit messages between the previous pointer and current.

As long as I write clear commit messages, my changelogs automatically contain useful information.

I can also add comments in reply to the changelogs.

All of it is automatically accessible via #meta hashtag

I have been using this: https://keepachangelog.com/en/1.0.0/

I particularly like the consul changelog https://github.com/hashicorp/consul/blob/master/CHANGELOG.md which follows it.