Turn off systemd watchdog with override
master -> maxscale (blr) -> replica
Create large dataset (suggest >1TB, 100000s tables and 1000s schema)
Slap it for 5 GiB of binlogs with maxscale binlog keeping logs
create replica using the snapshot and change master to mxs, and start it.
You know you're on to a winner when maxctrl times out.
Then run systemctl stop maxscale.
There's a 1/3 chance it'll leave rpl_state blank. Or sometimes all blr service rpl_states blank, even those without replicas attached.