nftlb binary package in Ubuntu Mantic s390x

 nftlb stands for nftables load balancer, the next generation linux firewall
 that replaces iptables, is adapted to behave as a complete load balancer and
 traffic distributor.
 .
 nftlb is provided with a JSON API, so you can use your preferred health
 checker to enable/disable backends or virtual services and automate processed
 with it.
 .
 The nftables framework used for load balancing can outperform typical LVS
 deployments by 10x.

Source package