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
  
  from keystone.conf import utils
  
  
  template_file = cfg.StrOpt(
      'template_file',
      default='default_catalog.templates',
      help=utils.fmt("""
  Catalog template file name for use with the template catalog backend.
  """))
  
  driver = cfg.StrOpt(
      'driver',
      default='sql',
      help=utils.fmt("""
  Entrypoint for the catalog backend driver in the keystone.catalog namespace.
  Supplied drivers are kvs, sql, templated, and endpoint_filter.sql
  """))
  
  aching = cfg.BoolOpt(
      'caching',
      default=True,
      help=utils.fmt("""
  Toggle for catalog caching. This has no effect unless global caching is
  enabled.
  """))
  
  cache_time = cfg.IntOpt(
      'cache_time',
      help=utils.fmt("""
  Time to cache catalog data (in seconds). This has no effect unless global and
  catalog caching are enabled.
  """))
  
  list_limit = cfg.IntOpt(
      'list_limit',
      help=utils.fmt("""
  Maximum number of entities that will be returned in a catalog collection.
  """))
  
  
  GROUP_NAME = __name__.split('.')[-1]
  ALL_OPTS = [
      template_file,
      driver,
      aching,
      cache_time,
      list_limit,
  ]
  
  
  def register_opts(conf):
      conf.register_opts(ALL_OPTS, group=GROUP_NAME)
  
  
  def list_opts():
      return {GROUP_NAME: ALL_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
  
  from keystone.conf import utils
  
  
  template_file = cfg.StrOpt(
      'template_file',
      default='default_catalog.templates',
      help=utils.fmt("""
  Absolute path to the file used for the templated catalog backend. This option
  is only used if the `[catalog] driver` is set to `templated`.
  """))
  
  driver = cfg.StrOpt(
      'driver',
      default='sql',
      help=utils.fmt("""
  Entry point for the catalog driver in the `keystone.catalog` namespace.
  Keystone provides a `sql` option (which supports basic CRUD operations through
  SQL), a `templated` option (which loads the catalog from a templated catalog
  file on disk), and a `endpoint_filter.sql` option (which supports arbitrary
  service catalogs per project).
  """))
  
  aching = cfg.BoolOpt(
      'caching',
      default=True,
      help=utils.fmt("""
  Toggle for catalog caching. This has no effect unless global caching is
  enabled. In a typical deployment, there is no reason to disable this.
  """))
  
  cache_time = cfg.IntOpt(
      'cache_time',
      help=utils.fmt("""
  Time to cache catalog data (in seconds). This has no effect unless global and
  catalog caching are both enabled. Catalog data (services, endpoints, etc.)
  typically does not change frequently, and so a longer duration than the global
  default may be desirable.
  """))
  
  list_limit = cfg.IntOpt(
      'list_limit',
      help=utils.fmt("""
  Maximum number of entities that will be returned in a catalog collection. There
  is typically no reason to set this, as it would be unusual for a deployment to
  have enough services or endpoints to exceed a reasonable limit.
  """))
  
  
  GROUP_NAME = __name__.split('.')[-1]
  ALL_OPTS = [
      template_file,
      driver,
      aching,
      cache_time,
      list_limit,
  ]
  
  
  def register_opts(conf):
      conf.register_opts(ALL_OPTS, group=GROUP_NAME)
  
  
  def list_opts():
      return {GROUP_NAME: ALL_OPTS}
  
subject: Improve keystone.conf [catalog] documentation