Your certificate library item Migrated certificate - YYYY-MM-DDTHH:MM:SS.#### - cellFQDN (id: ############, description: Migrated during cell startup at: YYYY-MM-DDTHH:MM:SS.#### , org: System) expired 60 day(s) ago at YYYY-MM-DDTHH:MM:SS.#### [Etc/UTC].
VMware Cloud Director 10.x.
This issue occurs because the VCD cell is still using an expired certificate. The VCD system's health monitoring detects the expiration and automatically sends alert emails to the administrators.
To resolve this issue, the certificates on the affected VCD cell must be updated or renewed.