Revision history can tell you what a rule set looked in the historical version. You can review which rules were active, what was the definition, and who made the changes.
You can review the revision history of a rule set by selecting “Revisions” from the drop-down menu when viewing a ruleset.

A new modal window will appear, with a list of all historical changes and who made them. The window is titled “Revision” and includes the Revision, Time, User, and View columns. The Compare column has two radio buttons. By clicking the eye icon, you can see the definition of the ruleset at that time.
Select one revision in the left radio column and another in the right column, then choose “Compare” to see the two definitions side by side.
For a rule set, the window has no Revert column. The eye icon opens the revision on its own page, titled with [REVISION] before the rule set's name. Select “Back to rule set” to return, or select the circular-arrow Revert button at the top right and confirm the revert.

Example of Ruleset revision
