Error when relating multiple vault-kv applications

[kelkawi-a]

Bug Description

We plan on using Vault as a secret store for multiple different charmed applications by relating them through the vault-kv interface. The expectation is that each application would get its own mount point when relating to the same vault-k8s charm. The charm currently goes into an error state with the below output from the logs.

vault-k8s/0*            error     idle   10.1.232.48         hook failed: "vault-peers-relation-changed"

To Reproduce

1. juju deploy vault-k8s --channel=1.16/edge --revision=256
2. Initialize and unseal the vault
3. Deploy two separate vault-kv requirer charms (the one from the integration tests will do)
4. Relate the requirer charms to the vault-k8s charm.

Environment

Operating system: Ubuntu 22.04.4 LTS

Juju CLI: 3.5.2-genericlinux-amd64

Juju agent: 3.5.2

Charm revision: 256

microk8s: v1.25.16

Relevant log output

unit-vault-k8s-0: 00:28:13 ERROR unit.vault-k8s/0.juju-log vault-peers:17: Uncaught exception while in charm code:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/./src/charm.py", line 1569, in <module>
    main(VaultCharm)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/main.py", line 548, in main
    manager.run()
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/main.py", line 527, in run
    self._emit()
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/main.py", line 516, in _emit
    _emit_charm_event(self.charm, self.dispatcher.event_name)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/main.py", line 147, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/framework.py", line 348, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/framework.py", line 860, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/framework.py", line 950, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/./src/charm.py", line 404, in _configure
    self._sync_vault_kv()
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/./src/charm.py", line 562, in _sync_vault_kv
    outstanding_kv_requests = self.vault_kv.get_outstanding_kv_requests()
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/lib/charms/vault_k8s/v0/vault_kv.py", line 408, in get_outstanding_kv_requests
    if not self._credentials_issued_for_request(
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/lib/charms/vault_k8s/v0/vault_kv.py", line 449, in _credentials_issued_for_request
    relation = self.model.get_relation(self.relation_name, relation_id)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/model.py", line 245, in get_relation
    return self.relations._get_unique(relation_name, relation_id)
  File "/var/lib/juju/agents/unit-vault-k8s-0/charm/venv/ops/model.py", line 939, in _get_unique
    raise TooManyRelatedAppsError(relation_name, num_related, 1)
ops.model.TooManyRelatedAppsError: Too many remote applications on vault-kv (2 > 1)

Additional context

No response

[gruyaume]

Hello @kelkawi-a thank you for opening this issue. We should be looking at it in the next couple of days. Thank you.