Percona Kubernetes Operator for Percona XtraDB Cluster comes with two different proxies, HAProxy and ProxySQL. While the initial version was based on ProxySQL, in time, Percona opted to set HAProxy as the default Proxy for the operator, without removing ProxySQL.  While one of the main points was to guarantee users to have a 1:1 compatibility [&]

https://www.percona.com/blog/2021/01/11/percona-kubernetes-operator-for-percona-xtradb-cluster-haproxy-or-proxysql/