code: func (s *PresenceService) DeleteTunnelConnection(clusterName, connectionName string) error {
  	if clusterName == "" {
  		return trace.BadParameter("missing cluster name")
  	}
  	if connectionName == "" {
  		return trace.BadParameter("missing connection name")
  	}
  	return s.Delete(context.TODO(), backend.Key(tunnelConnectionsPrefix, clusterName, connectionName))
  }
docs: // DeleteTunnelConnection deletes tunnel connection by name