cert-manager Certificate commonName

https://cert-manager.io/docs/usage/certificate/

The use of the common name field has been deprecated since 2000 and is discouraged from being used.

commonNameフィールドのない、IssuerがselfSignedなCertificateを作るとCertificateRequestのイベントにBadConfigが出る

https://github.com/cert-manager/cert-manager/issues/3634#issuecomment-774292453

I think I found a workaround: add
commonName: what.ever
to the Certificate.