It would be useful to be able to track changes to a specific variable over time across all variable sets and projects. These kinds of changes are available now in the audit logs for projects and variable sets, but are very cumbersome to sort through if you are looking for a specific variable.

I would propose an interface that lets you filter the audit log to a specific variable name (potentially utilizing wildcards as well) and limits the view to the values of that variable along with the scope and modified date. You should also be able to filter/sort by the scope and the location of the variable (project, variable set, etc)