No release history was found for the requested project (Drupal).

Thanks for reporting. A partial outage over the weekend caused this bad response to be cached. That cache has now been cleared.

The issue seems to be fixed now. Thanks!

I think there are more issues, at least these two:

https://updates.drupal.org/release-history/iframe/current
https://updates.drupal.org/release-history/csv_importer/current

I’ve purged the caches for all updates.drupal.org, so this should be resolved now.

Automatically closed - issue fixed for 2 weeks with no activity.