Past Logs
Past Logs give you a opportunity to look into the past to for a picture of activity happening in your hub in case you did not see what you want in Current Logs (which shows activity only while that page is open). Functionality is otherwise similar to Current Logs as described in Logs.
Note that the hub has a size-based limit on past logs. Old logs will be periodically cleaned based on this size limit, with the oldest logs being removed first. If you find that your past logs do not go back far enough for your needs, the best solution is to minimize unnecessary app and driver logging. Most built-in apps and drivers have options to control these log entries (third-party code may vary; consult the developer if you are unsure).