Comment 4 for bug 1822063

mhm, my more basic bundle didn't hit that:

series: bionic

applications:
  mysql:
    charm: cs:percona-cluster
    num_units: 1
  keystone:
    charm: cs:keystone
    num_units: 1
  glance:
    charm: cs:glance
    num_units: 1
  vault:
    charm: cs:vault
    num_units: 1

relations:
  - [ keystone:shared-db, mysql:shared-db ]
  - [ glance:shared-db, mysql:shared-db ]
  - [ keystone:identity-service, glance:identity-service ]

  - [ vault:shared-db, mysql ]

  - [ keystone, vault:certificates ]
  - [ glance, vault:certificates ]

I'm going to try your test bundle