code: func (a *AuthServer) GetCertAuthority(id services.CertAuthID, loadSigningKeys bool, opts ...services.MarshalOption) (services.CertAuthority, error) {
  	return a.GetCache().GetCertAuthority(id, loadSigningKeys, opts...)
  }
docs: // GetCertAuthority returns certificate authority by given id. Parameter loadSigningKeys
  // controls if signing keys are loaded