diff --git a/mistral/api/controllers/v2/execution.py b/mistral/api/controllers/v2/execution.py
index 945feb908..784a849f1 100644
--- a/mistral/api/controllers/v2/execution.py
+++ b/mistral/api/controllers/v2/execution.py
@@ -23,6 +23,7 @@ from wsme import types as wtypes
 import wsmeext.pecan as wsme_pecan
 
 from mistral.api import access_control as acl
+from mistral.api.controllers.v2 import execution_report
 from mistral.api.controllers.v2 import resources
 from mistral.api.controllers.v2 import task
 from mistral.api.controllers.v2 import types
@@ -82,6 +83,7 @@ def _get_workflow_execution(id, must_exist=True):
 
 class ExecutionsController(rest.RestController):
     tasks = task.ExecutionTasksController()
+    report = execution_report.ExecutionReportController()
 
     @rest_utils.wrap_wsme_controller_exception
     @wsme_pecan.wsexpose(resources.Execution, wtypes.text)
diff --git a/mistral/api/controllers/v2/execution_report.py b/mistral/api/controllers/v2/execution_report.py
new file mode 100644
index 000000000..d1750577e
--- /dev/null
+++ b/mistral/api/controllers/v2/execution_report.py
@@ -0,0 +1,164 @@
+# Copyright 2019 - Nokia Networks.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+
+from oslo_log import log as logging
+from pecan import rest
+import wsmeext.pecan as wsme_pecan
+
+from mistral.api.controllers.v2 import resources
+from mistral.api.controllers.v2 import types
+from mistral.db.v2 import api as db_api
+from mistral.db.v2.sqlalchemy import models as db_models
+from mistral.utils import rest_utils
+from mistral.workflow import states
+
+
+LOG = logging.getLogger(__name__)
+
+
+def create_workflow_execution_entry(wf_ex):
+    return resources.WorkflowExecutionReportEntry.from_db_model(wf_ex)
+
+
+def create_task_execution_entry(task_ex):
+    return resources.TaskExecutionReportEntry.from_db_model(task_ex)
+
+
+def create_action_execution_entry(action_ex):
+    return resources.ActionExecutionReportEntry.from_db_model(action_ex)
+
+
+def update_statistics_with_task(stat, task_ex):
+    if task_ex.state == states.RUNNING:
+        stat.increment_running()
+    elif task_ex.state == states.SUCCESS:
+        stat.increment_success()
+    elif task_ex.state == states.ERROR:
+        stat.increment_error()
+    elif task_ex.state == states.IDLE:
+        stat.increment_idle()
+    elif task_ex.state == states.PAUSED:
+        stat.increment_paused()
+
+
+def analyse_task_execution(task_ex_id, stat, filters, cur_depth):
+    with db_api.transaction():
+        task_ex = db_api.get_task_execution(task_ex_id)
+
+        if filters['errors_only'] and task_ex.state != states.ERROR:
+            return None
+
+        update_statistics_with_task(stat, task_ex)
+
+        entry = create_task_execution_entry(task_ex)
+
+        child_executions = task_ex.executions
+
+    entry.action_executions = []
+    entry.workflow_executions = []
+
+    for c_ex in child_executions:
+        if isinstance(c_ex, db_models.ActionExecution):
+            entry.action_executions.append(
+                create_action_execution_entry(c_ex)
+            )
+        else:
+            entry.workflow_executions.append(
+                analyse_workflow_execution(c_ex.id, stat, filters, cur_depth)
+            )
+
+    return entry
+
+
+def analyse_workflow_execution(wf_ex_id, stat, filters, cur_depth):
+    with db_api.transaction():
+        wf_ex = db_api.get_workflow_execution(wf_ex_id)
+
+        entry = create_workflow_execution_entry(wf_ex)
+
+        max_depth = filters['max_depth']
+
+        # Don't get deeper into the workflow task executions if
+        # maximum depth is defined and the current depth exceeds it.
+        if 0 <= max_depth < cur_depth:
+            return entry
+
+        task_execs = wf_ex.task_executions
+
+    entry.task_executions = []
+
+    for t_ex in task_execs:
+        task_exec_entry = analyse_task_execution(
+            t_ex.id,
+            stat,
+            filters,
+            cur_depth + 1
+        )
+
+        if task_exec_entry:
+            entry.task_executions.append(task_exec_entry)
+
+    return entry
+
+
+def build_report(wf_ex_id, filters):
+    report = resources.ExecutionReport()
+
+    stat = resources.ExecutionReportStatistics()
+
+    report.statistics = stat
+    report.root_workflow_execution = analyse_workflow_execution(
+        wf_ex_id,
+        stat,
+        filters,
+        0
+    )
+
+    return report
+
+
+class ExecutionReportController(rest.RestController):
+    @rest_utils.wrap_wsme_controller_exception
+    @wsme_pecan.wsexpose(resources.ExecutionReport, types.uuid, bool, int)
+    def get(self, workflow_execution_id, errors_only=False, max_depth=-1):
+        """Return workflow execution report.
+
+        :param workflow_execution_id: The ID of the workflow execution to
+            generate a report for.
+        :param errors_only: Optional. If True, only error paths of the
+            execution tree are included into the report. The root execution
+            (with the specified id) is always included, but its tasks may
+            or may not be included depending on this flag's value.
+        :param max_depth: Optional. Limits the depth of recursion while
+            obtaining the execution tree. That is, subworkflows of what
+            maximum depth will be included into the report. If a value of the
+            flag is a negative number then no limit is set.
+            The root execution has depth 0 so if the flag is 0 then only
+            the root execution, its tasks and their actions will be included.
+            If some of the tasks in turn run workflows then these subworkflows
+            will be also included but without their tasks. The algorithm will
+            fully analyse their tasks only if max_depth is greater than zero.
+        """
+
+        LOG.info(
+            "Fetch execution report [workflow_execution_id=%s]",
+            workflow_execution_id
+        )
+
+        filters = {
+            'errors_only': errors_only,
+            'max_depth': max_depth
+        }
+
+        return build_report(workflow_execution_id, filters)
diff --git a/mistral/api/controllers/v2/resources.py b/mistral/api/controllers/v2/resources.py
index d19e62a0f..3d6eee051 100644
--- a/mistral/api/controllers/v2/resources.py
+++ b/mistral/api/controllers/v2/resources.py
@@ -721,3 +721,158 @@ class EventTriggers(resource.ResourceList):
                                 "marker=123e4567-e89b-12d3-a456-426655440000")
 
         return triggers_sample
+
+
+class BaseExecutionReportEntry(resource.Resource):
+    """Execution report entry resource."""
+
+    id = wtypes.text
+    name = wtypes.text
+    created_at = wtypes.text
+    updated_at = wtypes.text
+    state = wtypes.text
+    state_info = wtypes.text
+
+    @classmethod
+    def sample(cls):
+        # TODO(rakhmerov): complete
+
+        return cls(
+            id='123e4567-e89b-12d3-a456-426655441414',
+            created_at='2019-01-30T00:00:00.000000',
+            updated_at='2019-01-30T00:00:00.000000',
+            state=states.SUCCESS
+        )
+
+
+class ActionExecutionReportEntry(BaseExecutionReportEntry):
+    """Action execution report entry resource."""
+
+    accepted = bool
+    last_heartbeat = wtypes.text
+
+    @classmethod
+    def sample(cls):
+        sample = super(ActionExecutionReportEntry, cls).sample()
+
+        sample.accepted = True
+        sample.last_heartbeat = '2019-01-30T00:00:00.000000'
+
+        return sample
+
+
+class WorkflowExecutionReportEntry(BaseExecutionReportEntry):
+    """Workflow execution report entry resource."""
+
+    # NOTE(rakhmerov): task_executions has to be declared below
+    # after we declare a class for task execution entry resource.
+
+    @classmethod
+    def sample(cls):
+        sample = super(WorkflowExecutionReportEntry, cls).sample()
+
+        # We can't define a non-empty list task executions here because
+        # the needed class is not defined yet. Since this is just a sample
+        # we can sacrifice it.
+        sample.task_executions = []
+
+        return sample
+
+
+class TaskExecutionReportEntry(BaseExecutionReportEntry):
+    """Task execution report entity resource."""
+
+    action_executions = [ActionExecutionReportEntry]
+    workflow_executions = [WorkflowExecutionReportEntry]
+
+    @classmethod
+    def sample(cls):
+        sample = super(TaskExecutionReportEntry, cls).sample()
+
+        sample.action_executions = [ActionExecutionReportEntry.sample()]
+        sample.workflow_executions = []
+
+        return sample
+
+
+# We have to declare this field later because of the dynamic binding.
+# It can't be within WorkflowExecutionReportEntry before
+# TaskExecutionReportEntry is declared.
+WorkflowExecutionReportEntry.task_executions = [TaskExecutionReportEntry]
+wtypes.registry.reregister(WorkflowExecutionReportEntry)
+
+
+class ExecutionReportStatistics(resource.Resource):
+    """Execution report statistics.
+
+    TODO(rakhmerov): There's much more we can add here. For example,
+    information about action, average (and also min and max) task execution
+    run time etc.
+    """
+
+    total_tasks_count = wtypes.IntegerType(minimum=0)
+    running_tasks_count = wtypes.IntegerType(minimum=0)
+    success_tasks_count = wtypes.IntegerType(minimum=0)
+    error_tasks_count = wtypes.IntegerType(minimum=0)
+    idle_tasks_count = wtypes.IntegerType(minimum=0)
+    paused_tasks_count = wtypes.IntegerType(minimum=0)
+
+    def __init__(self, **kw):
+        self.total_tasks_count = 0
+        self.running_tasks_count = 0
+        self.success_tasks_count = 0
+        self.error_tasks_count = 0
+        self.idle_tasks_count = 0
+        self.paused_tasks_count = 0
+
+        super(ExecutionReportStatistics, self).__init__(**kw)
+
+    def increment_running(self):
+        self.running_tasks_count += 1
+        self.total_tasks_count += 1
+
+    def increment_success(self):
+        self.success_tasks_count += 1
+        self.total_tasks_count += 1
+
+    def increment_error(self):
+        self.error_tasks_count += 1
+        self.total_tasks_count += 1
+
+    def increment_idle(self):
+        self.idle_tasks_count += 1
+        self.total_tasks_count += 1
+
+    def increment_paused(self):
+        self.paused_tasks_count += 1
+        self.total_tasks_count += 1
+
+    @classmethod
+    def sample(cls):
+        return cls(
+            total_tasks_count=10,
+            running_tasks_count=3,
+            success_tasks_count=5,
+            error_tasks_count=2,
+            idle_tasks_count=0,
+            paused_tasks_count=0
+        )
+
+
+class ExecutionReport(resource.Resource):
+    """Execution report resource."""
+
+    statistics = ExecutionReportStatistics
+    """General statistics about the workflow execution hierarchy."""
+
+    root_workflow_execution = WorkflowExecutionReportEntry
+    """Root entry of the report associated with a workflow execution."""
+
+    @classmethod
+    def sample(cls):
+        sample = cls()
+
+        sample.statistics = ExecutionReportStatistics.sample()
+        sample.root_workflow_execution = WorkflowExecutionReportEntry.sample()
+
+        return sample
diff --git a/mistral/api/controllers/v2/task.py b/mistral/api/controllers/v2/task.py
index 070b3b62d..5974da629 100644
--- a/mistral/api/controllers/v2/task.py
+++ b/mistral/api/controllers/v2/task.py
@@ -36,8 +36,15 @@ from mistral.workflow import states
 
 
 LOG = logging.getLogger(__name__)
-STATE_TYPES = wtypes.Enum(str, states.IDLE, states.RUNNING, states.SUCCESS,
-                          states.ERROR, states.RUNNING_DELAYED)
+
+STATE_TYPES = wtypes.Enum(
+    str,
+    states.IDLE,
+    states.RUNNING,
+    states.SUCCESS,
+    states.ERROR,
+    states.RUNNING_DELAYED
+)
 
 
 def _get_task_resource_with_result(task_ex):
diff --git a/mistral/tests/unit/api/v2/test_execution_report.py b/mistral/tests/unit/api/v2/test_execution_report.py
new file mode 100644
index 000000000..295745ac2
--- /dev/null
+++ b/mistral/tests/unit/api/v2/test_execution_report.py
@@ -0,0 +1,406 @@
+# Copyright 2019 - Nokia Networks, Inc.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License");
+#    you may not use this file except in compliance with the License.
+#    You may obtain a copy of the License at
+#
+#        http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS,
+#    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+#    See the License for the specific language governing permissions and
+#    limitations under the License.
+
+from mistral.services import workbooks as wb_service
+from mistral.services import workflows as wf_service
+from mistral.tests.unit.api import base
+from mistral.tests.unit.engine import base as engine_base
+from mistral.workflow import states
+
+
+class TestExecutionReportController(base.APITest, engine_base.EngineTestCase):
+    def test_simple_sequence_wf(self):
+        wf_text = """---
+        version: '2.0'
+
+        wf:
+          tasks:
+            task1:
+              action: std.noop
+              on-success: task2
+
+            task2:
+              action: std.fail
+        """
+
+        wf_service.create_workflows(wf_text)
+
+        wf_ex = self.engine.start_workflow('wf')
+
+        self.await_workflow_error(wf_ex.id)
+
+        resp = self.app.get('/v2/executions/%s/report' % wf_ex.id)
+
+        self.assertEqual(200, resp.status_int)
+
+        # Now let's verify the response structure
+
+        self.assertIn('root_workflow_execution', resp.json)
+
+        root_wf_ex = resp.json['root_workflow_execution']
+
+        self.assertIsInstance(root_wf_ex, dict)
+        self.assertEqual(wf_ex.id, root_wf_ex['id'])
+        self.assertEqual(wf_ex.name, root_wf_ex['name'])
+        self.assertEqual(states.ERROR, root_wf_ex['state'])
+        self.assertGreater(len(root_wf_ex['state_info']), 0)
+
+        tasks = root_wf_ex['task_executions']
+
+        self.assertIsInstance(tasks, list)
+
+        self.assertEqual(2, len(tasks))
+
+        # Verify task1 info.
+        task1 = self._assert_single_item(
+            tasks,
+            name='task1',
+            state=states.SUCCESS
+        )
+
+        self.assertEqual(0, len(task1['workflow_executions']))
+        self.assertEqual(1, len(task1['action_executions']))
+
+        task1_action = task1['action_executions'][0]
+
+        self.assertEqual(states.SUCCESS, task1_action['state'])
+        self.assertEqual('std.noop', task1_action['name'])
+
+        # Verify task2 info.
+        task2 = self._assert_single_item(
+            tasks,
+            name='task2',
+            state=states.ERROR
+        )
+
+        self.assertEqual(1, len(task2['action_executions']))
+
+        task2_action = task2['action_executions'][0]
+
+        self.assertEqual(0, len(task2['workflow_executions']))
+        self.assertEqual(states.ERROR, task2_action['state'])
+
+        # Verify statistics.
+        stat = resp.json['statistics']
+
+        self.assertEqual(1, stat['error_tasks_count'])
+        self.assertEqual(0, stat['idle_tasks_count'])
+        self.assertEqual(0, stat['paused_tasks_count'])
+        self.assertEqual(0, stat['running_tasks_count'])
+        self.assertEqual(1, stat['success_tasks_count'])
+        self.assertEqual(2, stat['total_tasks_count'])
+
+    def test_nested_wf(self):
+        wb_text = """---
+        version: '2.0'
+
+        name: wb
+
+        workflows:
+          parent_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                workflow: sub_wf
+                on-success: task3
+
+              task3:
+                action: std.fail
+
+          sub_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                action: std.fail
+        """
+
+        wb_service.create_workbook_v2(wb_text)
+
+        wf_ex = self.engine.start_workflow('wb.parent_wf')
+
+        self.await_workflow_error(wf_ex.id)
+
+        resp = self.app.get('/v2/executions/%s/report' % wf_ex.id)
+
+        self.assertEqual(200, resp.status_int)
+
+        # Now let's verify the response structure
+
+        self.assertIn('root_workflow_execution', resp.json)
+
+        root_wf_ex = resp.json['root_workflow_execution']
+
+        self.assertIsInstance(root_wf_ex, dict)
+        self.assertEqual('wb.parent_wf', root_wf_ex['name'])
+        self.assertEqual(states.ERROR, root_wf_ex['state'])
+        self.assertGreater(len(root_wf_ex['state_info']), 0)
+
+        tasks = root_wf_ex['task_executions']
+
+        self.assertIsInstance(tasks, list)
+
+        self.assertEqual(2, len(tasks))
+
+        # Verify task1 info.
+        task1 = self._assert_single_item(tasks, name='task1')
+
+        self.assertEqual(states.SUCCESS, task1['state'])
+        self.assertEqual(0, len(task1['workflow_executions']))
+        self.assertEqual(1, len(task1['action_executions']))
+
+        task1_action = task1['action_executions'][0]
+        self.assertEqual(states.SUCCESS, task1_action['state'])
+        self.assertEqual('std.noop', task1_action['name'])
+
+        # Verify task2 info.
+        task2 = self._assert_single_item(tasks, name='task2')
+
+        self.assertEqual(states.ERROR, task2['state'])
+        self.assertEqual(0, len(task2['action_executions']))
+        self.assertEqual(1, len(task2['workflow_executions']))
+
+        sub_wf_entry = task2['workflow_executions'][0]
+        self.assertEqual(states.ERROR, sub_wf_entry['state'])
+
+        sub_wf_tasks = sub_wf_entry['task_executions']
+
+        self.assertEqual(2, len(sub_wf_tasks))
+
+        sub_wf_task1 = self._assert_single_item(
+            sub_wf_tasks,
+            name='task1',
+            state=states.SUCCESS
+        )
+        sub_wf_task2 = self._assert_single_item(
+            sub_wf_tasks,
+            name='task2',
+            state=states.ERROR
+        )
+
+        self.assertEqual(1, len(sub_wf_task1['action_executions']))
+        self.assertEqual(
+            states.SUCCESS,
+            sub_wf_task1['action_executions'][0]['state']
+        )
+
+        self.assertEqual(1, len(sub_wf_task2['action_executions']))
+        self.assertEqual(
+            states.ERROR,
+            sub_wf_task2['action_executions'][0]['state']
+        )
+
+        # Verify statistics.
+        stat = resp.json['statistics']
+
+        self.assertEqual(2, stat['error_tasks_count'])
+        self.assertEqual(0, stat['idle_tasks_count'])
+        self.assertEqual(0, stat['paused_tasks_count'])
+        self.assertEqual(0, stat['running_tasks_count'])
+        self.assertEqual(2, stat['success_tasks_count'])
+        self.assertEqual(4, stat['total_tasks_count'])
+
+    def test_nested_wf_errors_only(self):
+        wb_text = """---
+        version: '2.0'
+
+        name: wb
+
+        workflows:
+          parent_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                workflow: sub_wf
+                on-success: task3
+
+              task3:
+                action: std.fail
+
+          sub_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                action: std.fail
+        """
+
+        wb_service.create_workbook_v2(wb_text)
+
+        wf_ex = self.engine.start_workflow('wb.parent_wf')
+
+        self.await_workflow_error(wf_ex.id)
+
+        resp = self.app.get(
+            '/v2/executions/%s/report?errors_only=true' % wf_ex.id
+        )
+
+        self.assertEqual(200, resp.status_int)
+
+        # Now let's verify the response structure
+
+        self.assertIn('root_workflow_execution', resp.json)
+
+        root_wf_ex = resp.json['root_workflow_execution']
+
+        self.assertIsInstance(root_wf_ex, dict)
+        self.assertEqual('wb.parent_wf', root_wf_ex['name'])
+        self.assertEqual(states.ERROR, root_wf_ex['state'])
+        self.assertGreater(len(root_wf_ex['state_info']), 0)
+
+        tasks = root_wf_ex['task_executions']
+
+        self.assertIsInstance(tasks, list)
+
+        self.assertEqual(1, len(tasks))
+
+        # There must be only task2 in the response.
+        # Verify task2 info.
+        task2 = self._assert_single_item(tasks, name='task2')
+
+        self.assertEqual(states.ERROR, task2['state'])
+        self.assertEqual(0, len(task2['action_executions']))
+        self.assertEqual(1, len(task2['workflow_executions']))
+
+        sub_wf_entry = task2['workflow_executions'][0]
+        self.assertEqual(states.ERROR, sub_wf_entry['state'])
+
+        sub_wf_tasks = sub_wf_entry['task_executions']
+
+        self.assertEqual(1, len(sub_wf_tasks))
+
+        sub_wf_task2 = self._assert_single_item(
+            sub_wf_tasks,
+            name='task2',
+            state=states.ERROR
+        )
+
+        self.assertEqual(1, len(sub_wf_task2['action_executions']))
+        self.assertEqual(
+            states.ERROR,
+            sub_wf_task2['action_executions'][0]['state']
+        )
+
+        # Verify statistics.
+        stat = resp.json['statistics']
+
+        self.assertEqual(2, stat['error_tasks_count'])
+        self.assertEqual(0, stat['idle_tasks_count'])
+        self.assertEqual(0, stat['paused_tasks_count'])
+        self.assertEqual(0, stat['running_tasks_count'])
+        self.assertEqual(0, stat['success_tasks_count'])
+        self.assertEqual(2, stat['total_tasks_count'])
+
+    def test_nested_wf_max_depth(self):
+        wb_text = """---
+        version: '2.0'
+
+        name: wb
+
+        workflows:
+          parent_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                workflow: sub_wf
+                on-success: task3
+
+              task3:
+                action: std.fail
+
+          sub_wf:
+            tasks:
+              task1:
+                action: std.noop
+                on-success: task2
+
+              task2:
+                action: std.fail
+        """
+
+        wb_service.create_workbook_v2(wb_text)
+
+        wf_ex = self.engine.start_workflow('wb.parent_wf')
+
+        self.await_workflow_error(wf_ex.id)
+
+        resp = self.app.get('/v2/executions/%s/report?max_depth=0' % wf_ex.id)
+
+        self.assertEqual(200, resp.status_int)
+
+        # Now let's verify the response structure
+
+        self.assertIn('root_workflow_execution', resp.json)
+
+        root_wf_ex = resp.json['root_workflow_execution']
+
+        self.assertIsInstance(root_wf_ex, dict)
+        self.assertEqual('wb.parent_wf', root_wf_ex['name'])
+        self.assertEqual(states.ERROR, root_wf_ex['state'])
+        self.assertGreater(len(root_wf_ex['state_info']), 0)
+
+        tasks = root_wf_ex['task_executions']
+
+        self.assertIsInstance(tasks, list)
+
+        self.assertEqual(2, len(tasks))
+
+        # Verify task1 info.
+        task1 = self._assert_single_item(tasks, name='task1')
+
+        self.assertEqual(states.SUCCESS, task1['state'])
+        self.assertEqual(0, len(task1['workflow_executions']))
+        self.assertEqual(1, len(task1['action_executions']))
+
+        task1_action = task1['action_executions'][0]
+        self.assertEqual(states.SUCCESS, task1_action['state'])
+        self.assertEqual('std.noop', task1_action['name'])
+
+        # Verify task2 info.
+        task2 = self._assert_single_item(tasks, name='task2')
+
+        self.assertEqual(states.ERROR, task2['state'])
+        self.assertEqual(0, len(task2['action_executions']))
+        self.assertEqual(1, len(task2['workflow_executions']))
+
+        sub_wf_entry = task2['workflow_executions'][0]
+        self.assertEqual(states.ERROR, sub_wf_entry['state'])
+
+        # We still must have an entry for the subworkflow itself
+        # but it must not have info about task executions because
+        # we've now limited max depth.
+        self.assertNotIn('task_executions', sub_wf_entry)
+
+        # Verify statistics.
+        stat = resp.json['statistics']
+
+        self.assertEqual(1, stat['error_tasks_count'])
+        self.assertEqual(0, stat['idle_tasks_count'])
+        self.assertEqual(0, stat['paused_tasks_count'])
+        self.assertEqual(0, stat['running_tasks_count'])
+        self.assertEqual(1, stat['success_tasks_count'])
+        self.assertEqual(2, stat['total_tasks_count'])