The issue has been resolved and all pending webhooks have been processed. Service levels in sandbox are back to normal. Thanks for your patience as we worked to resolve this issue.

We have fixed the underlying issue and we can already observe that webhook performance is being restored. We are monitoring it and will provide further updates shortly.

We have identified an issue that is causing degraded performance with the webhook service in sandbox, due to insufficient service resources. We're working to have it resolved promptly.