There are a few solutions on GH Actions Marketplace that we may want to use:

• https://github.com/marketplace/actions/pull-request-auto-size-labeler
• https://github.com/marketplace/actions/pr-size-watcher
• https://github.com/marketplace/actions/pr-size-checker

Possible positive effects:

• A size label "tiny" could encourage quick reviews of trivial changes.
• A size label "huge" could help flag problematic PRs.