Failed to pre-delete resources for cluster XXXX

[Felipe Reyes]

[Impact]

When deleting a cluster (k8s) and the load balancer associated to it has already been deleted, a 404 error is returned by Heat which raises a heatclient.exc.HTTPNotFound exception.

Full stack trace:

[req-7a8d257d-9cca-4d2d-b108-de8f33f60ae1 - - - - -] Exception during message handling: magnum.common.exception.PreDeletionFailed: Failed to pre-delete resources for cluster 6d553e2f-74bb-4dbe-9fd1-1a123b76530b, error: ERROR: The Stack (37032d90-66f1-41dd-b584-67d10f438bd9) could not be found..
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/magnum/common/octavia.py", line 109, in delete_loadbalancers
    lb_resources = heat_client.resources.list(
  File "/usr/lib/python3/dist-packages/heatclient/v1/resources.py", line 70, in list
    return self._list(url, "resources")
  File "/usr/lib/python3/dist-packages/heatclient/common/base.py", line 114, in _list
    body = self.client.get(url).json()
  File "/usr/lib/python3/dist-packages/heatclient/common/http.py", line 289, in get
    return self.client_request("GET", url, **kwargs)
  File "/usr/lib/python3/dist-packages/heatclient/common/http.py", line 282, in client_request
    resp, body = self.json_request(method, url, **kwargs)
  File "/usr/lib/python3/dist-packages/heatclient/common/http.py", line 271, in json_request
    resp = self._http_request(url, method, **kwargs)
  File "/usr/lib/python3/dist-packages/heatclient/common/http.py", line 234, in _http_request
    raise exc.from_response(resp)
heatclient.exc.HTTPNotFound: ERROR: The Stack (37032d90-66f1-41dd-b584-67d10f438bd9) could not be found.

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/server.py", line 165, in _process_incoming
    res = self.dispatcher.dispatch(message)
  File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 276, in dispatch
    return self._do_dispatch(endpoint, method, ctxt, args)
  File "/usr/lib/python3/dist-packages/oslo_messaging/rpc/dispatcher.py", line 196, in _do_dispatch
    result = func(ctxt, **new_args)
  File "/usr/lib/python3/dist-packages/magnum/conductor/handlers/cluster_conductor.py", line 191, in cluster_delete
    cluster_driver.delete_cluster(context, cluster)
  File "/usr/lib/python3/dist-packages/magnum/drivers/heat/driver.py", line 162, in delete_cluster
    self.pre_delete_cluster(context, cluster)
  File "/usr/lib/python3/dist-packages/magnum/drivers/heat/driver.py", line 307, in pre_delete_cluster
    octavia.delete_loadbalancers(context, cluster)
  File "/usr/lib/python3/dist-packages/magnum/common/octavia.py", line 130, in delete_loadbalancers
    raise exception.PreDeletionFailed(cluster_uuid=cluster.uuid,
magnum.common.exception.PreDeletionFailed: Failed to pre-delete resources for cluster 6d553e2f-74bb-4dbe-9fd1-1a123b76530b, error: ERROR: The Stack (37032d90-66f1-41dd-b584-67d10f438bd9) could not be found..
2024-03-12 14:38:35.878 3553570 ERROR oslo_messaging.rpc.server

[ Test Plan ]

TBD

[ Where problems could occur ]

TBD

[Other Info]

This issue has been fixed in Magnum by commit https://opendev.org/openstack/magnum/commit/4888f706c8a0280971df398cbc1ff06ad5d63e7f ( https://review.opendev.org/c/openstack/magnum/+/818563 ), this was released in Magnum-14.0.0 (Yoga release) and backported to 13.1.0 (Xena), and even when it was backported into the stable/wallaby branch ( https://review.opendev.org/c/openstack/magnum/+/820334 ), no releases were cut after it was merged