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.
  
  from oslo_config import cfg
  
  
  periodic_opts = [
      cfg.BoolOpt('periodic_global_stack_list',
                  default=False,
                  help="List Heat stacks globally when syncing clusters. "
                       "Default is to do retrieve each cluster's stack  "
                       "individually. Reduces number of requests against "
                       "Heat API if enabled but requires changes to Heat's "
                       "policy.json."),
      cfg.BoolOpt('periodic_enable',
                  default=True,
                  help='Enable periodic tasks.'),
      cfg.IntOpt('periodic_interval_max',
                 default=60,
                 help='Max interval size between periodic tasks execution in '
                      'seconds.'),
  ]
  
  
  def register_opts(conf):
      conf.register_opts(periodic_opts)
  
  
  def list_opts():
      return {
          "DEFAULT": periodic_opts
      }
  
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.
  
  from oslo_config import cfg
  
  
  periodic_opts = [
      cfg.BoolOpt('periodic_enable',
                  default=True,
                  help='Enable periodic tasks.'),
      cfg.IntOpt('periodic_interval_max',
                 default=60,
                 help='Max interval size between periodic tasks execution in '
                      'seconds.'),
  ]
  
  
  def register_opts(conf):
      conf.register_opts(periodic_opts)
  
  
  def list_opts():
      return {
          "DEFAULT": periodic_opts
      }
  
subject: Remove unused config periodic_global_stack_list