old_contents: # 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.
  
  import unittest
  
  from openstack.tests.functional import base
  
  
  @unittest.skipUnless(base.service_exists(service_type="metering"),
                       "Metering service does not exist")
  class TestStatistics(base.BaseFunctionalTest):
  
      def test_list(self):
          found_something = False
          for met in self.conn.telemetry.meters():
              try:
                  stat = next(self.conn.telemetry.statistics(met))
                  self.assertIn('period_end', stat)
                  found_something = True
              except Exception:
                  pass
          self.assertTrue(found_something)
  
new_contents: # 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.
  
  import unittest
  
  from openstack.tests.functional import base
  
  
  @unittest.skipUnless(base.service_exists(service_type="metering"),
                       "Metering service does not exist")
  class TestStatistics(base.BaseFunctionalTest):
  
      def test_list(self):
          for met in self.conn.telemetry.meters():
              for stat in self.conn.telemetry.statistics(met):
                  self.assertTrue(stat.period_end_at is not None)
                  break
  
subject: Fix the telemetry statistics test