This may be the reason we did not use MySQL for HA:
Jul 04 05:19:28 juju-82c980-disco-proposed-testing-38 vault[17065]: 2019-07-04T05:19:28.259Z [ERROR] core: failed to acquire lock: error="Error 1105: Percona-XtraDB-Cluster prohibits use of GET_LOCK with pxc_strict_mode = ENFORCING"
This may be the reason we did not use MySQL for HA:
Jul 04 05:19:28 juju-82c980- disco-proposed- testing- 38 vault[17065]: 2019-07- 04T05:19: 28.259Z [ERROR] core: failed to acquire lock: error="Error 1105: Percona- XtraDB- Cluster prohibits use of GET_LOCK with pxc_strict_mode = ENFORCING"