To reduce click-outs to non-converting product detail pages, you can show the stock status of the products you've included in your product hotspots.
Show stock status:
Include the product-specific stock information in your product feed by adding the availability header in your TSV feed or the <g:availability> attribute in your XML feed.
The supported values are:
out of stock
Once the feed contains the necessary stock information, you can enable the Show Product status option in the Hotspots tab of the Viewer Customization menu.
Enable Product status: