The email service is functioning normally -- so on-open email recommendations should resume working as expected. We are still seeing some symptoms of issues with Google Cloud's backend services, and are waiting on Google Cloud to address those issues and confirm resolution of the underlying issue at https://status.cloud.google.com/incidents/xVSEV3kVaJBmS7SZbnre. We will continue to monitor the situation closely until they have done so.
We are investigating issues with our email rendering service due to which on-open email recommendations are expected to not render properly. This is likely due to issues with the Google Cloud infrastructure. We're still awaiting confirmation from Google Cloud that there's an issue on their end. In the meantime, we are looking into the best ways to mitigate and address the issue.
Another infrastructure component of ours is also affected, but this component is not end-user-facing and will not have an immediate impact on the end user experience.