Is there a module for tracking changes to a Drupal site's configuration?
I think you are looking for Configuration Management module.




  The module knows where configuration was changed and allows users to
  either "activate" a configuration that was changed in the datastore,
  or "write" to datastore if a configuration was changed in the
  activestore. If you enable the diff module, you can see the what is in
  the activestore vs. datastore.


and I'm not using this module before.