This question holds for the entire network of main and meta sites.
Looking through the activity tab for the Community user, I don't see any edit history for posts that have been randomly bumped (probably because no actual change is made to the post).
Is there any way to see the history of the Community user's bumping activity? (For example, through the API or SEDE.) I'd like to look at this data to see how effective bumping has been in the past, and see if we can come up with suggestions for improving it.