def METHOD_NAME(data, cluster):
    iptables_log = parse_syslog(data)
    if iptables_log is None:
        return
    service, instance = lookup_service_instance_by_ip(iptables_log["SRC"])
    if service is None or instance is None:
        return
    # prepend hostname
    log_line = iptables_log["hostname"] + ": " + iptables_log["message"]
    _log(
        service=service,
        component="security",
        level="debug",
        cluster=cluster,
        instance=instance,
        line=log_line,
    )