FYI some resources to research if interested:
Severalnines for an awesome monitoring solution (and even deployment in their EE versions) => https://severalnines.com/
Percona (don’t recommend their database/clustering but they have some really awesome tooling) => MySQL Tools and Management Software to Perform System Tasks by Percona
ProxySQL Example with Galera Clusters => Native Galera Support In ProxySQL - ProxySQL
HAProxy as a TCP proxy alternative to ProxySQL just no read/write splitting => https://galeracluster.com/library/documentation/ha-proxy.html