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FieldTypeDescriptionValue(s)
issuingCACertificateAndKeyThe currently active issuing certificate authority for the Kubernetes API server.

This field should only be set for the controlplane machines.
The value contains a private key and a certificate, PEM encoded.
acceptedCAs[]stringThe list of accepted CA certificates for the Kubernetes API server.

The value should be a PEM encoded certificate.
The issuing CA certificate is automatically added to the list of accepted CAs.