This attribute describes the status of an item such as 'preorder', 'in stock' or 'out of stock'.
The attribute is required, meaning it has to be used for every product. In case you will not continue to offer an item on Google Shopping, don’t indicate this with the availability attribute, but rather remove the item completely from your feed.
The availability status in your data feed must always correspond with the status on your landing page. This page should display the availability status for all your targeted countries. Moreover the attributes values must be in the same language as the attributes names. Use the value 'out of stock' if you want to provide products in the future but not consistently. Don’t remove these items from the data feed.