we experiencing some issues with the Admin API - we're using the API for the transfer of orders and products to our BI tool minubo. It all worked really good and without any problems since december last year.
We are already using pagination and since now more than two weeks we regularly get responses where the "link" to the following page is missing in the response - and definitely also when it is not the last page, mostly directly with the first page. You can see this behavior in the screenshot - the number of products inserted should be greater than 11.000 and not a smaller multiply of 250 - it should be easily reproducible with a simple request for the first 250 products:
The last X-Request-ID: ebf8feee-5d3e-42a6-afc6-62c616e8006d
We can't provide authenticated support in the community forums, and there's no example of the request you're making, but I tested the /admin/api/2023-07/products.json?limit=250 endpoint on my test store and was unable to replicate any issues with missing header links from the REST Admin API following our guide on REST pagination.