Community user bumps one question "randomly" selected every hour. At the site quite time it looks that it's too much, disappointing, etc. At this moment I don't remember if this might be customized per site. In such case, it will be necessary to make a feature-request.
Before making one, I suggest you to look at Meta Stack Exchange about the discussions about this feature as well about the feature request process. Regarding the feature request process, start at the feature-request wiki -> https://meta.stackexchange.com/tags/feature-request/info.
Regarding questions that are bumped too many times, that happens because those questions and/or their answers are neglected. "The solution" for neglected posts is to answer and moderate the site: upvote, downvote, edit, flag, vote to close, vote to delete, comment. There is no shame in skipping, but not having enough moderators (community members moderating the site) partially explaing having so many bumped posts.
Regarding data, Stack Exchange Data Explorer (SEDE) (in the footer the links just says "Data") might be helpful. There are a lot of queries. Probably there is already some about bumped posts. Also in Meta SE there are several questions about SE / data-explorer.
At the end, the question is, is really a problem having bumped posts multiple times? What will be the effect of stopping Community user from bumping all posts? What will be the effect of limiting the number of times that a post is bumped? Is there another way to handle neglected posts that might be more effective that bumping them?
- What can cause a question to be bumped?
- How to stop the Community user from dredging up old questions over and over?
- Having the Community user offering bounties instead of bumping