This extension was originally written by KiwiCommerce but has been archived since November 2020. Since we (at elgentos) feel this extension is the best inventory logger extension available, we decided to adopt it.
This extension only works on Magento 2.4.x. Upgrade y'all.
composer require elgentos/magento2-inventory-log
php bin/magento setup:upgrade
Navigate to Product > Catalog and Click on edit link of the product. Then click 'Inventory Log' under Quantity option. You'll see a graph plotting the 100 most recent stock movements, and a grid showing all stock movements.
A grid with all stock movement can now be found under Reports > (Products) Stock Movement.
From the Inventory Log Grid, you can click on Graph to see the same graph as on the product edit page;
You need to follow this path. Stores > Configuration > Catalog > Inventory > Stock Options > Inventory Log Enabled.
Lots of thanks goes to KiwiCommerce for initially developing this extension. We know open-source maintenance is hard, so we appreciate it!