MariaDB cluster with Galera-Abitrator-4 [gcs_proto_ver: 3]
M1,M2,M3 are 3 machines running Debian GNU/Linux 11 (bullseye)
recently (june2024) after apt update & upgrade
M1 & M2 are MariaDB nodes Ver 15.1 Distrib 10.6.18-MariaDB
M3 is arbitrator using galera-arbitrator-4 Ver 4.11.r