Kratos operator targets wrong StatefulSet when pulled in as a neighbor app

[PeishuoCai]

Bug Description

During charm-integration-testing runs, when kratos is pull in as the neighbor charm and attempts to patch, it targets a Kubernetes StatefulSet named kratos, instead of the correct name (neighbor). This mismatch causes repeated hook failures and test skips across multiple runs.

Additionally, the charm attempts to read /etc/config/kratos/kratos.yaml before it exists, causing a separate ops.pebble.PathError.

These two issues cause neighbor/0 to enter an error state during integration tests.

Example failing run:
https://test-observer.canonical.com/#/charms/289345?testExecutionId=289026&testResultId=7975559

Batch of skipped runs showing identical failures:
https://test-observer.canonical.com/#/test-results?families=charm&artefacts=loki-k8s&execution_metadata=charm_qa%3Acharm:kratos&issues=none

To Reproduce

refer to run:
https://test-observer.canonical.com/#/charms/289345?testExecutionId=289026&testResultId=7975559

Environment

ran on latest/stable

Relevant log output

2025-11-24T18:58:55.276Z [container-agent] 2025-11-24 18:58:55 ERROR juju-log Uncaught exception while in charm code:
2025-11-24T18:58:55.276Z [container-agent] Traceback (most recent call last):
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/lightkube/core/generic_client.py", line 188, in raise_for_status
2025-11-24T18:58:55.276Z [container-agent]     resp.raise_for_status()
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/httpx/_models.py", line 829, in raise_for_status
2025-11-24T18:58:55.276Z [container-agent]     raise HTTPStatusError(message, request=request, response=self)
2025-11-24T18:58:55.276Z [container-agent] httpx.HTTPStatusError: Client error '404 Not Found' for url 'https://10.152.183.1/apis/apps/v1/namespaces/model-19645599047-251124185117/statefulsets/kratos?fieldManager=neighbor'
2025-11-24T18:58:55.276Z [container-agent] For more information check: https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/404
2025-11-24T18:58:55.276Z [container-agent] 
2025-11-24T18:58:55.276Z [container-agent] During handling of the above exception, another exception occurred:
2025-11-24T18:58:55.276Z [container-agent] 
2025-11-24T18:58:55.276Z [container-agent] Traceback (most recent call last):
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 1350, in <module>
2025-11-24T18:58:55.276Z [container-agent]     main(KratosCharm)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/__init__.py", line 343, in __call__
2025-11-24T18:58:55.276Z [container-agent]     return _main.main(charm_class=charm_class, use_juju_for_storage=use_juju_for_storage)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 543, in main
2025-11-24T18:58:55.276Z [container-agent]     manager.run()
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 529, in run
2025-11-24T18:58:55.276Z [container-agent]     self._emit()
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 518, in _emit
2025-11-24T18:58:55.276Z [container-agent]     _emit_charm_event(self.charm, self.dispatcher.event_name, self._juju_context)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 134, in _emit_charm_event
2025-11-24T18:58:55.276Z [container-agent]     event_to_emit.emit(*args, **kwargs)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 347, in emit
2025-11-24T18:58:55.276Z [container-agent]     framework._emit(event)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 857, in _emit
2025-11-24T18:58:55.276Z [container-agent]     self._reemit(event_path)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 947, in _reemit
2025-11-24T18:58:55.276Z [container-agent]     custom_handler(event)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 900, in _on_pebble_ready
2025-11-24T18:58:55.276Z [container-agent]     self._patch_statefulset()
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 978, in _patch_statefulset
2025-11-24T18:58:55.276Z [container-agent]     self.client.patch(StatefulSet, name=self.meta.name, namespace=self.model.name, obj=patch)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/lightkube/core/client.py", line 325, in patch
2025-11-24T18:58:55.276Z [container-agent]     return self._client.request("patch", res=res, name=name, namespace=namespace, obj=obj,
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/lightkube/core/generic_client.py", line 245, in request
2025-11-24T18:58:55.276Z [container-agent]     return self.handle_response(method, resp, br)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/lightkube/core/generic_client.py", line 196, in handle_response
2025-11-24T18:58:55.276Z [container-agent]     self.raise_for_status(resp)
2025-11-24T18:58:55.276Z [container-agent]   File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/lightkube/core/generic_client.py", line 190, in raise_for_status
2025-11-24T18:58:55.276Z [container-agent]     raise transform_exception(e)
2025-11-24T18:58:55.276Z [container-agent] lightkube.core.exceptions.ApiError: statefulsets.apps "kratos" not found
2025-11-24T18:58:55.615Z [container-agent] 2025-11-24 18:58:55 ERROR juju.worker.uniter.operation runhook.go:180 hook "kratos-pebble-ready" (via hook dispatching script: dispatch) failed: exit status 1



unit-neighbor-0: 2025-11-24 19:05:21 ERROR unit.neighbor/0.juju-log pg-database:21: Uncaught exception while in charm code:
Traceback (most recent call last):
  File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 1350, in <module>
    main(KratosCharm)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/__init__.py", line 343, in __call__
    return _main.main(charm_class=charm_class, use_juju_for_storage=use_juju_for_storage)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 543, in main
    manager.run()
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 529, in run
    self._emit()
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 518, in _emit
    _emit_charm_event(self.charm, self.dispatcher.event_name, self._juju_context)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/_main.py", line 134, in _emit_charm_event
    event_to_emit.emit(*args, **kwargs)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 347, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 857, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 947, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/lib/charms/data_platform_libs/v0/data_interfaces.py", line 2213, in _on_relation_changed_event
    getattr(self.on, "database_created").emit(
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 347, in emit
    framework._emit(event)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 857, in _emit
    self._reemit(event_path)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/framework.py", line 947, in _reemit
    custom_handler(event)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 1014, in _on_database_created
    self._handle_status_update_config(event)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/./src/charm.py", line 867, in _handle_status_update_config
    self._restart_service()
  File "/var/lib/juju/agents/unit-neighbor-0/charm/src/utils.py", line 81, in wrapper
    current_config = charm._container.pull(CONFIG_FILE_PATH).read()
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/model.py", line 2524, in pull
    return self._pebble.pull(str(path), encoding=encoding)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/pebble.py", line 2432, in pull
    self._raise_on_path_error(resp, path)
  File "/var/lib/juju/agents/unit-neighbor-0/charm/venv/ops/pebble.py", line 2457, in _raise_on_path_error
    raise PathError(error['kind'], error['message'])
ops.pebble.PathError: not-found - stat /etc/config/kratos/kratos.yaml: no such file or directory

Additional context

No response