Hi Ramprasath,
I'm not on the ProxySQL team, but the release announcement for v3.02 does mention Group replication support for MySQL 8.4 and 9.x
I would assume from that statement that it should be compatible with MySQL 8.4, otherwise why specifically mention group replication for 8.4 and 9.x.
I'm not running against 8.4 in any current workload, but we are looking at it as an option for some newer workloads in the future
Regards,
Dave