I have personal Herald rule setup, that flags all commits that touch certain files. Before last update the created flag had Flagged by Herald Rule "{Herald Rule Name}". note. Right now note is empty.
The change was made as part of T8726 task, but I'm not sure if removing flag note was done on purpose (task doesn't mention that) or by accident.
Related commit: rP8d9bd791f7f263648c5a811695a000889a136be7