old_contents: # -*- encoding: utf-8 -*-
  # Copyright (c) 2015 b<>com
  #
  # Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
  #
  # 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.
  #
  
  """
  The :ref:`Cluster History <cluster_history_definition>` contains all the
  previously collected timestamped data such as metrics and events associated
  to any :ref:`managed resource <managed_resource_definition>` of the
  :ref:`Cluster <cluster_definition>`.
  
  Just like the :ref:`Cluster Data Model <cluster_data_model_definition>`, this
  history may be used by any :ref:`Strategy <strategy_definition>` in order to
  find the most optimal :ref:`Solution <solution_definition>` during an
  :ref:`Audit <audit_definition>`.
  
  In the Watcher project, a generic
  :ref:`Cluster History <cluster_history_definition>`
  API is proposed with some helper classes in order to :
  
  -  share a common measurement (events or metrics) naming based on what is
     defined in Ceilometer.
     See `the full list of available measurements <http://docs.openstack.org/admin-guide-cloud/telemetry-measurements.html>`_
  -  share common meter types (Cumulative, Delta, Gauge) based on what is
     defined in Ceilometer.
     See `the full list of meter types <http://docs.openstack.org/admin-guide-cloud/telemetry-measurements.html>`_
  -  simplify the development of a new :ref:`Strategy <strategy_definition>`
  -  avoid duplicating the same code in several
     :ref:`Strategies <strategy_definition>`
  -  have a better consistency between the different
     :ref:`Strategies <strategy_definition>`
  -  avoid any strong coupling with any external metrics/events storage system
     (the proposed API and measurement naming system acts as a pivot format)
  
  Note however that a developer can use his/her own history management system if
  the Ceilometer system does not fit his/her needs as long as the
  :ref:`Strategy <strategy_definition>` is able to produce a
  :ref:`Solution <solution_definition>` for the requested
  :ref:`Goal <goal_definition>`.
  
  The :ref:`Cluster History <cluster_history_definition>` data may be persisted
  in any appropriate storage system (InfluxDB, OpenTSDB, MongoDB,...).
  """  # noqa
  
  import abc
  import six
  
  """Work in progress Helper to query metrics"""
  
  
  @six.add_metaclass(abc.ABCMeta)
  class BaseClusterHistory(object):
      @abc.abstractmethod
      def statistic_aggregation(self, resource_id, meter_name, period,
                                aggregate='avg'):
          raise NotImplementedError()
  
      @abc.abstractmethod
      def get_last_sample_values(self, resource_id, meter_name, limit=1):
          raise NotImplementedError()
  
      def query_sample(self, meter_name, query, limit=1):
          raise NotImplementedError()
  
      def statistic_list(self, meter_name, query=None, period=None):
          raise NotImplementedError()
  
new_contents: # -*- encoding: utf-8 -*-
  # Copyright (c) 2015 b<>com
  #
  # Authors: Jean-Emile DARTOIS <jean-emile.dartois@b-com.com>
  #
  # 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.
  #
  
  """
  The :ref:`Cluster History <cluster_history_definition>` contains all the
  previously collected timestamped data such as metrics and events associated
  to any :ref:`managed resource <managed_resource_definition>` of the
  :ref:`Cluster <cluster_definition>`.
  
  Just like the :ref:`Cluster Data Model <cluster_data_model_definition>`, this
  history may be used by any :ref:`Strategy <strategy_definition>` in order to
  find the most optimal :ref:`Solution <solution_definition>` during an
  :ref:`Audit <audit_definition>`.
  
  In the Watcher project, a generic
  :ref:`Cluster History <cluster_history_definition>`
  API is proposed with some helper classes in order to :
  
  -  share a common measurement (events or metrics) naming based on what is
     defined in Ceilometer.
     See `the full list of available measurements <http://docs.openstack.org/admin-guide/telemetry-measurements.html>`_
  -  share common meter types (Cumulative, Delta, Gauge) based on what is
     defined in Ceilometer.
     See `the full list of meter types <http://docs.openstack.org/admin-guide/telemetry-measurements.html>`_
  -  simplify the development of a new :ref:`Strategy <strategy_definition>`
  -  avoid duplicating the same code in several
     :ref:`Strategies <strategy_definition>`
  -  have a better consistency between the different
     :ref:`Strategies <strategy_definition>`
  -  avoid any strong coupling with any external metrics/events storage system
     (the proposed API and measurement naming system acts as a pivot format)
  
  Note however that a developer can use his/her own history management system if
  the Ceilometer system does not fit his/her needs as long as the
  :ref:`Strategy <strategy_definition>` is able to produce a
  :ref:`Solution <solution_definition>` for the requested
  :ref:`Goal <goal_definition>`.
  
  The :ref:`Cluster History <cluster_history_definition>` data may be persisted
  in any appropriate storage system (InfluxDB, OpenTSDB, MongoDB,...).
  """  # noqa
  
  import abc
  import six
  
  """Work in progress Helper to query metrics"""
  
  
  @six.add_metaclass(abc.ABCMeta)
  class BaseClusterHistory(object):
      @abc.abstractmethod
      def statistic_aggregation(self, resource_id, meter_name, period,
                                aggregate='avg'):
          raise NotImplementedError()
  
      @abc.abstractmethod
      def get_last_sample_values(self, resource_id, meter_name, limit=1):
          raise NotImplementedError()
  
      def query_sample(self, meter_name, query, limit=1):
          raise NotImplementedError()
  
      def statistic_list(self, meter_name, query=None, period=None):
          raise NotImplementedError()
  
subject: Fix reference http