The following error is found in the mistral logs related to the get_deployment_failures task:

2018-08-14 01:35:39.076 7 INFO mistral.engine.engine_server [req-54094e03-e859-43b3-b6da-cd865d613290 f80f44084ac74f3f92a738b308880500 252292bd925748d9974d6f444d5a5f03 - default default] Received RPC request 'start_workflow'[workflow_identifier=tripleo.deployment.v1.get_deployment_failures, workflow_input={plan: overcloud}, description=, params={}]
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server [req-54094e03-e859-43b3-b6da-cd865d613290 f80f44084ac74f3f92a738b308880500 252292bd925748d9974d6f444d5a5f03 - default default] Exception during message handling: DBEntityNotFoundError: Workflow not found [workflow_identifier=tripleo.deployment.v1.get_deployment_failures, namespace=]
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server Traceback (most recent call last):
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/server.py", line 163, in _process_incoming
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     res = self.dispatcher.dispatch(message)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 265, in dispatch
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     return self._do_dispatch(endpoint, method, ctxt, args)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/oslo_messaging/rpc/dispatcher.py", line 194, in _do_dispatch
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     result = func(ctxt, **new_args)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/engine/engine_server.py", line 110, in start_workflow
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     **params
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/db/utils.py", line 88, in decorate
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     return retry.call(_with_auth_context, auth_ctx, func, *args, **kw)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/tenacity/__init__.py", line 330, in call
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     start_time=start_time)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/tenacity/__init__.py", line 279, in iter
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     return fut.result()
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/concurrent/futures/_base.py", line 422, in result
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     return self.__get_result()
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/tenacity/__init__.py", line 333, in call
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     result = fn(*args, **kwargs)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/db/utils.py", line 45, in _with_auth_context
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     return func(*args, **kw)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/engine/action_queue.py", line 94, in decorate
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     res = func(*args, **kw)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 159, in wrapper
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     result = f(*args, **kwargs)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/engine/default_engine.py", line 64, in start_workflow
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     params
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/osprofiler/profiler.py", line 159, in wrapper
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     result = f(*args, **kwargs)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/engine/workflow_handler.py", line 44, in start_workflow
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     wf_def = db_api.get_workflow_definition(wf_identifier, wf_namespace)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/db/v2/api.py", line 121, in get_workflow_definition
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     fields=fields
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/db/sqlalchemy/base.py", line 117, in _within_session
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     result = func(*args, **kw)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server   File "/usr/lib/python2.7/site-packages/mistral/db/v2/sqlalchemy/api.py", line 463, in get_workflow_definition
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server     % (identifier, namespace)
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server DBEntityNotFoundError: Workflow not found [workflow_identifier=tripleo.deployment.v1.get_deployment_failures, namespace=]
2018-08-14 01:35:39.090 7 ERROR oslo_messaging.rpc.server 

LOGS: https://logs.rdoproject.org/openstack-periodic/git.openstack.org/openstack-infra/tripleo-ci/master/legacy-periodic-tripleo-ci-centos-7-multinode-1ctlr-featureset050-upgrades-master/9ab3df8/logs/undercloud/var/log/containers/mistral/engine.log.txt.gz#_2018-08-14_01_35_39_076