The highest tagged major version is v4.

cert-manager/

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Path	Synopsis
v1 Package v1 contains API Schema definitions for the cert-manager v1 API group +k8s:deepcopy-gen=package,register +groupName=cert-manager.io	Package v1 contains API Schema definitions for the cert-manager v1 API group +k8s:deepcopy-gen=package,register +groupName=cert-manager.io