Adam, I suspect you might have hit the cluster bootstrap issue that has been observed when deploying multiple units of percona at once. Can you please provide the output of:
juju ssh percona/0 "mysql -uroot -pagoodpassword -e \"show status like 'wsrep_cluster%';\""
...replacing the username/password and unit number appropriately and running for all units deployed.
In particular check that the cluster size is equal to the number of units of percona you have deployed.
Adam, I suspect you might have hit the cluster bootstrap issue that has been observed when deploying multiple units of percona at once. Can you please provide the output of:
juju ssh percona/0 "mysql -uroot -pagoodpassword -e \"show status like 'wsrep_ cluster% ';\""
...replacing the username/password and unit number appropriately and running for all units deployed.
In particular check that the cluster size is equal to the number of units of percona you have deployed.