in the latest version which has Microsoft released is a new feature :-) !!
I have noticed this in version 18.104.22.1689 which has been deployed to us last weekend.
You will find it in the Settings area - it is call CUSTOM SOLUTIONS HISTORY.
It shows the history of imports of your cusotm solutions and the results of these imports.
Previously we were using the xrmtoolbox to enable this feature. Now it is out-of-box.
Great improvement I think.