GitHub introduced a pull request review mechanism that groups inline review comments together and allows a reviewer to approve or request changes to the PR with a review summary comment.
Issue #20 discusses inline comments. The comment I'm most interested here is the review summary along with the decision to approve/reject the review. The tool currently seems to miss it, so I suppose this review summary comment does not get reported in an issue_comment.created event.
I'm not sure what event gets triggered in that case, perhaps pull_request_review_comment?
For an example of a pull request with a review summary comment, see: w3c/presentation-api#351