code: func (a *AuthServer) GetCertAuthorities(caType services.CertAuthType, loadSigningKeys bool, opts ...services.MarshalOption) ([]services.CertAuthority, error) {
  	return a.GetCache().GetCertAuthorities(caType, loadSigningKeys, opts...)
  }
docs: // GetCertAuthorities returns a list of authorities of a given type
  // loadSigningKeys controls whether signing keys should be loaded or not