Add noisy neighbor strategy doc

Change-Id: I84add2103fd12c7b0c7e36d57fdfc4fe43e933b1

doc/source/strategies/noisy_neighbor.rst

@@ -0,0 +1,97 @@
+==============
+Noisy neighbor
+==============
+
+Synopsis
+--------
+
+**display name**: ``Noisy Neighbor``
+
+**goal**: ``noisy_neighbor``
+
+    .. watcher-term:: watcher.decision_engine.strategy.strategies.noisy_neighbor.NoisyNeighbor
+
+Requirements
+------------
+
+Metrics
+*******
+
+The *noisy_neighbor* strategy requires the following metrics:
+
+============================ ============ ======= =======================
+metric                       service name plugins comment
+============================ ============ ======= =======================
+``cpu_l3_cache``             ceilometer_  none     Intel CMT_ is required
+============================ ============ ======= =======================
+
+.. _CMT: http://www.intel.com/content/www/us/en/architecture-and-technology/resource-director-technology.html
+.. _ceilometer: https://docs.openstack.org/ceilometer/latest/admin/telemetry-measurements.html#openstack-compute
+
+Cluster data model
+******************
+
+Default Watcher's Compute cluster data model:
+
+    .. watcher-term:: watcher.decision_engine.model.collector.nova.NovaClusterDataModelCollector
+
+Actions
+*******
+
+Default Watcher's actions:
+
+    .. list-table::
+       :widths: 30 30
+       :header-rows: 1
+
+       * - action
+         - description
+       * - ``migration``
+         - .. watcher-term:: watcher.applier.actions.migration.Migrate
+
+Planner
+*******
+
+Default Watcher's planner:
+
+    .. watcher-term:: watcher.decision_engine.planner.weight.WeightPlanner
+
+Configuration
+-------------
+
+Strategy parameter is:
+
+==================== ====== ============= ============================
+parameter            type   default       Value description
+==================== ====== ============= ============================
+``cache_threshold``  Number 35.0          Performance drop in L3_cache
+                                          threshold for migration
+==================== ====== ============= ============================
+
+
+Efficacy Indicator
+------------------
+
+None
+
+Algorithm
+---------
+
+For more information on the noisy neighbor strategy please refer to:
+http://specs.openstack.org/openstack/watcher-specs/specs/pike/implemented/noisy_neighbor_strategy.html
+
+How to use it ?
+---------------
+
+.. code-block:: shell
+
+    $ openstack optimize audittemplate create \
+      at1 noisy_neighbor --strategy noisy_neighbor
+
+    $ openstack optimize audit create -a at1 \
+      -p cache_threshold=45.0
+
+External Links
+--------------
+
+None