Out-of-stock product page is indexable

What this means

The Product markup on this page declares the offer as out of stock or sold out, and the page is still open to indexing. That is a judgement call rather than a defect: keeping the URL indexed preserves its accumulated ranking and inbound links for when the item returns, but a listing that sends searchers to something they cannot buy earns poor engagement signals. Worth a deliberate decision either way.

How to fix it

If the item is coming back, keep the page indexed and say so on it — show a restock date, an email-me-when-available form, and links to close alternatives. If it is discontinued for good, 301 it to the closest replacement or the parent category rather than leaving a dead end.

Fix effort

This check needs review: the change can be drafted for you, but a person has to approve the wording or choose the target before it ships.

Authoritative source

https://developers.google.com/search/docs/appearance/structured-data/product