Documentation on goal and efficacy

In this changeset, I wrote a documentation detailing how one can
implement a new goal plugin. I also mention to define the efficacy
specification for a given goal.

Partially Implements: blueprint efficacy-indicator

Change-Id: Iba267ae312f248b49d4600504f11678cdc225622

watcher/api/controllers/v1/action_plan.py

@@ -16,9 +16,11 @@
 # limitations under the License.
 
 """
-An :ref:`Action Plan <action_plan_definition>` is a flow of
+An :ref:`Action Plan <action_plan_definition>` specifies a flow of
 :ref:`Actions <action_definition>` that should be executed in order to satisfy
-a given :ref:`Goal <goal_definition>`.
+a given :ref:`Goal <goal_definition>`. It also contains an estimated
+:ref:`global efficacy <efficacy_definition>` alongside a set of
+:ref:`efficacy indicators <efficacy_indicator_definition>`.
 
 An :ref:`Action Plan <action_plan_definition>` is generated by Watcher when an
 :ref:`Audit <audit_definition>` is successful which implies that the
@@ -26,16 +28,13 @@ An :ref:`Action Plan <action_plan_definition>` is generated by Watcher when an
 which was used has found a :ref:`Solution <solution_definition>` to achieve the
 :ref:`Goal <goal_definition>` of this :ref:`Audit <audit_definition>`.
 
-In the default implementation of Watcher, an
-:ref:`Action Plan <action_plan_definition>`
-is only composed of successive :ref:`Actions <action_definition>`
-(i.e., a Workflow of :ref:`Actions <action_definition>` belonging to a unique
-branch).
+In the default implementation of Watcher, an action plan is composed of
+a list of successive :ref:`Actions <action_definition>` (i.e., a Workflow of
+:ref:`Actions <action_definition>` belonging to a unique branch).
 
 However, Watcher provides abstract interfaces for many of its components,
-allowing other implementations to generate and handle more complex
-:ref:`Action Plan(s) <action_plan_definition>`
-composed of two types of Action Item(s):
+allowing other implementations to generate and handle more complex :ref:`Action
+Plan(s) <action_plan_definition>` composed of two types of Action Item(s):
 
 -  simple :ref:`Actions <action_definition>`: atomic tasks, which means it
    can not be split into smaller tasks or commands from an OpenStack point of
@@ -46,13 +45,14 @@ composed of two types of Action Item(s):
 
 An :ref:`Action Plan <action_plan_definition>` may be described using
 standard workflow model description formats such as
-`Business Process Model and Notation 2.0 (BPMN 2.0) <http://www.omg.org/spec/BPMN/2.0/>`_
-or `Unified Modeling Language (UML) <http://www.uml.org/>`_.
+`Business Process Model and Notation 2.0 (BPMN 2.0)
+<http://www.omg.org/spec/BPMN/2.0/>`_ or `Unified Modeling Language (UML)
+<http://www.uml.org/>`_.
 
 To see the life-cycle and description of
-:ref:`Action Plan <action_plan_definition>` states, visit :ref:`the Action Plan state
-machine <action_plan_state_machine>`.
-"""  # noqa
+:ref:`Action Plan <action_plan_definition>` states, visit :ref:`the Action Plan
+state machine <action_plan_state_machine>`.
+"""
 
 import datetime
 

watcher/api/controllers/v1/efficacy_indicator.py

@@ -15,20 +15,20 @@
 # limitations under the License.
 
 """
-An efficacy indicator is a single value
-that gives an indication on how the :ref:`solution <solution_definition>`
-produced by a given :ref:`strategy <strategy_definition>` performed. These
-efficacy indicators are specific to a given :ref:`goal <goal_definition>` and
-are usually used to compute the :ref:`gobal efficacy <efficacy_definition>` of
-the resulting :ref:`action plan <action_plan_definition>`.
+An efficacy indicator is a single value that gives an indication on how the
+:ref:`solution <solution_definition>` produced by a given :ref:`strategy
+<strategy_definition>` performed. These efficacy indicators are specific to a
+given :ref:`goal <goal_definition>` and are usually used to compute the
+:ref:`gobal efficacy <efficacy_definition>` of the resulting :ref:`action plan
+<action_plan_definition>`.
 
 In Watcher, these efficacy indicators are specified alongside the goal they
 relate to. When a strategy (which always relates to a goal) is executed, it
-produces a solution containing the efficacy indicators specified by the
-goal. This solution, which has been translated by the :ref:`Watcher Planner
-<watcher_planner_definition>` into an action plan, will see its
-indicators and global efficacy stored and would now be accessible through the
-:ref:`Watcher API <watcher_api_definition>`.
+produces a solution containing the efficacy indicators specified by the goal.
+This solution, which has been translated by the :ref:`Watcher Planner
+<watcher_planner_definition>` into an action plan, will see its indicators and
+global efficacy stored and would now be accessible through the :ref:`Watcher
+API <archi_watcher_api_definition>`.
 """
 
 import numbers

watcher/decision_engine/audit/default.py

@@ -13,6 +13,7 @@
 # implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
+
 from oslo_log import log
 
 from watcher.common.messaging.events import event as watcher_event

watcher/decision_engine/goal/efficacy/base.py

@@ -14,6 +14,15 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
+"""
+An efficacy specfication is a contract that is associated to each :ref:`Goal
+<goal_definition>` that defines the various :ref:`efficacy indicators
+<efficacy_indicator_definition>` a strategy achieving the associated goal
+should provide within its :ref:`solution <solution_definition>`. Indeed, each
+solution proposed by a strategy will be validated against this contract before
+calculating its :ref:`global efficacy <efficacy_definition>`.
+"""
+
 import abc
 import json
 

watcher/decision_engine/solution/base.py

@@ -18,10 +18,17 @@
 #
 
 """
-A :ref:`Solution <solution_definition>` is a set of
-:ref:`Actions <action_definition>` generated by a
-:ref:`Strategy <strategy_definition>` (i.e., an algorithm) in order to achieve
-the :ref:`Goal <goal_definition>` of an :ref:`Audit <audit_definition>`.
+A :ref:`Solution <solution_definition>` is the result of execution of a
+:ref:`strategy <strategy_definition>` (i.e., an algorithm).
+Each solution is composed of many pieces of information:
+
+- A set of :ref:`actions <action_definition>` generated by the strategy in
+  order to achieve the :ref:`goal <goal_definition>` of an associated
+  :ref:`audit <audit_definition>`.
+- A set of :ref:`efficacy indicators <efficacy_indicator_definition>` as
+  defined by the associated goal
+- A :ref:`global efficacy <efficacy_definition>` which is computed by the
+  associated goal using the aforementioned efficacy indicators.
 
 A :ref:`Solution <solution_definition>` is different from an
 :ref:`Action Plan <action_plan_definition>` because it contains the

watcher/locale/watcher.pot

@@ -7,9 +7,9 @@
 #, fuzzy
 msgid ""
 msgstr ""
-"Project-Id-Version: python-watcher 0.26.1.dev33\n"
+"Project-Id-Version: python-watcher 0.26.1.dev88\n"
 "Report-Msgid-Bugs-To: EMAIL@ADDRESS\n"
-"POT-Creation-Date: 2016-05-11 15:31+0200\n"
+"POT-Creation-Date: 2016-06-02 10:23+0200\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -48,24 +48,24 @@ msgid ""
 "'public_endpoint' option."
 msgstr ""
 
-#: watcher/api/controllers/v1/action.py:364
+#: watcher/api/controllers/v1/action.py:365
 msgid "Cannot create an action directly"
 msgstr ""
 
-#: watcher/api/controllers/v1/action.py:388
+#: watcher/api/controllers/v1/action.py:389
 msgid "Cannot modify an action directly"
 msgstr ""
 
-#: watcher/api/controllers/v1/action.py:424
+#: watcher/api/controllers/v1/action.py:425
 msgid "Cannot delete an action directly"
 msgstr ""
 
-#: watcher/api/controllers/v1/action_plan.py:87
+#: watcher/api/controllers/v1/action_plan.py:91
 #, python-format
 msgid "Invalid state: %(state)s"
 msgstr ""
 
-#: watcher/api/controllers/v1/action_plan.py:407
+#: watcher/api/controllers/v1/action_plan.py:451
 #, python-format
 msgid "State transition not allowed: (%(initial_state)s -> %(new_state)s)"
 msgstr ""
@@ -74,15 +74,15 @@ msgstr ""
 msgid "The audit template UUID or name specified is invalid"
 msgstr ""
 
-#: watcher/api/controllers/v1/audit_template.py:138
+#: watcher/api/controllers/v1/audit_template.py:141
 #, python-format
 msgid ""
 "'%(strategy)s' strategy does relate to the '%(goal)s' goal. Possible "
 "choices: %(choices)s"
 msgstr ""
 
-#: watcher/api/controllers/v1/audit_template.py:160
-msgid "Cannot remove 'goal_uuid' attribute from an audit template"
+#: watcher/api/controllers/v1/audit_template.py:169
+msgid "Cannot remove 'goal' attribute from an audit template"
 msgstr ""
 
 #: watcher/api/controllers/v1/types.py:123
@@ -146,18 +146,19 @@ msgstr ""
 msgid "The target state is not defined"
 msgstr ""
 
-#: watcher/applier/actions/migration.py:71
+#: watcher/applier/actions/migration.py:69
 msgid "The parameter resource_id is invalid."
 msgstr ""
 
-#: watcher/applier/actions/migration.py:124
+#: watcher/applier/actions/migration.py:123
+#: watcher/applier/actions/migration.py:137
 #, python-format
 msgid ""
 "Unexpected error occured. Migration failed forinstance %s. Leaving "
 "instance on previous host."
 msgstr ""
 
-#: watcher/applier/actions/migration.py:140
+#: watcher/applier/actions/migration.py:155
 #, python-format
 msgid "Migration of type %(migration_type)s is not supported."
 msgstr ""
@@ -176,22 +177,22 @@ msgstr ""
 msgid "Oops! We need disaster recover plan"
 msgstr ""
 
+#: watcher/cmd/api.py:42
+#, python-format
+msgid "serving on 0.0.0.0:%(port)s, view at %(protocol)s://127.0.0.1:%(port)s"
+msgstr ""
+
 #: watcher/cmd/api.py:46
 #, python-format
-msgid "serving on 0.0.0.0:%(port)s, view at http://127.0.0.1:%(port)s"
+msgid "serving on %(protocol)s://%(host)s:%(port)s"
 msgstr ""
 
-#: watcher/cmd/api.py:50
-#, python-format
-msgid "serving on http://%(host)s:%(port)s"
-msgstr ""
-
-#: watcher/cmd/applier.py:41
+#: watcher/cmd/applier.py:38
 #, python-format
 msgid "Starting Watcher Applier service in PID %s"
 msgstr ""
 
-#: watcher/cmd/decisionengine.py:42
+#: watcher/cmd/decisionengine.py:39
 #, python-format
 msgid "Starting Watcher Decision Engine service in PID %s"
 msgstr ""
@@ -360,7 +361,7 @@ msgstr ""
 msgid "Action %(action)s could not be found"
 msgstr ""
 
-#: watcher/common/exception.py:238
+#: watcher/common/exception.py:238 watcher/common/exception.py:256
 #, python-format
 msgid "An action with UUID %(uuid)s already exists"
 msgstr ""
@@ -374,87 +375,114 @@ msgstr ""
 msgid "Filtering actions on both audit and action-plan is prohibited"
 msgstr ""
 
-#: watcher/common/exception.py:256
+#: watcher/common/exception.py:252
+#, python-format
+msgid "Efficacy indicator %(efficacy_indicator)s could not be found"
+msgstr ""
+
+#: watcher/common/exception.py:264
 #, python-format
 msgid "Couldn't apply patch '%(patch)s'. Reason: %(reason)s"
 msgstr ""
 
-#: watcher/common/exception.py:262
+#: watcher/common/exception.py:270
 #, python-format
 msgid "Workflow execution error: %(error)s"
 msgstr ""
 
-#: watcher/common/exception.py:266
+#: watcher/common/exception.py:274
 msgid "Illegal argument"
 msgstr ""
 
-#: watcher/common/exception.py:270
+#: watcher/common/exception.py:278
 msgid "No such metric"
 msgstr ""
 
-#: watcher/common/exception.py:274
+#: watcher/common/exception.py:282
 msgid "No rows were returned"
 msgstr ""
 
-#: watcher/common/exception.py:278
+#: watcher/common/exception.py:286
 #, python-format
 msgid "%(client)s connection failed. Reason: %(reason)s"
 msgstr ""
 
-#: watcher/common/exception.py:282
+#: watcher/common/exception.py:290
 msgid "'Keystone API endpoint is missing''"
 msgstr ""
 
-#: watcher/common/exception.py:286
+#: watcher/common/exception.py:294
 msgid "The list of hypervisor(s) in the cluster is empty"
 msgstr ""
 
-#: watcher/common/exception.py:290
+#: watcher/common/exception.py:298
 msgid "The metrics resource collector is not defined"
 msgstr ""
 
-#: watcher/common/exception.py:294
+#: watcher/common/exception.py:302
 msgid "The cluster state is not defined"
 msgstr ""
 
-#: watcher/common/exception.py:298
+#: watcher/common/exception.py:306
 #, python-format
 msgid "No strategy could be found to achieve the '%(goal)s' goal."
 msgstr ""
 
-#: watcher/common/exception.py:304
+#: watcher/common/exception.py:310
 #, python-format
-msgid "The instance '%(name)s' is not found"
+msgid "The value '%(value)s' with spec type '%(spec_type)s' is invalid."
 msgstr ""
 
-#: watcher/common/exception.py:308
-msgid "The hypervisor is not found"
-msgstr ""
-
-#: watcher/common/exception.py:312
+#: watcher/common/exception.py:315
 #, python-format
-msgid "Error loading plugin '%(name)s'"
-msgstr ""
-
-#: watcher/common/exception.py:316
-#, python-format
-msgid "The identifier '%(name)s' is a reserved word"
+msgid ""
+"Could not compute the global efficacy for the '%(goal)s' goal using the "
+"'%(strategy)s' strategy."
 msgstr ""
 
 #: watcher/common/exception.py:320
 #, python-format
-msgid "The %(name)s resource %(id)s is not soft deleted"
+msgid "No values returned by %(resource_id)s for %(metric_name)s."
 msgstr ""
 
 #: watcher/common/exception.py:324
+#, python-format
+msgid "No %(metric)s metric for %(host)s found."
+msgstr ""
+
+#: watcher/common/exception.py:330
+#, python-format
+msgid "The instance '%(name)s' is not found"
+msgstr ""
+
+#: watcher/common/exception.py:334
+msgid "The hypervisor is not found"
+msgstr ""
+
+#: watcher/common/exception.py:338
+#, python-format
+msgid "Error loading plugin '%(name)s'"
+msgstr ""
+
+#: watcher/common/exception.py:342
+#, python-format
+msgid "The identifier '%(name)s' is a reserved word"
+msgstr ""
+
+#: watcher/common/exception.py:346
+#, python-format
+msgid "The %(name)s resource %(id)s is not soft deleted"
+msgstr ""
+
+#: watcher/common/exception.py:350
 msgid "Limit should be positive"
 msgstr ""
 
-#: watcher/common/service.py:40
+#: watcher/common/service.py:43
 msgid "Seconds between running periodic tasks."
 msgstr ""
 
-#: watcher/common/service.py:43
+#: watcher/common/service.py:46
 msgid ""
 "Name of this node. This can be an opaque identifier.  It is not "
 "necessarily a hostname, FQDN, or IP address. However, the node name must "
@@ -462,7 +490,11 @@ msgid ""
 " or IP address."
 msgstr ""
 
-#: watcher/common/utils.py:53
+#: watcher/common/service.py:226
+msgid "Plugins"
+msgstr ""
+
+#: watcher/common/utils.py:76
 #, python-format
 msgid ""
 "Failed to remove trailing character. Returning original object.Supplied "
@@ -477,231 +509,266 @@ msgstr ""
 msgid "Messaging configuration error"
 msgstr ""
 
-#: watcher/db/purge.py:50
+#: watcher/db/purge.py:51
 msgid "Goals"
 msgstr ""
 
-#: watcher/db/purge.py:51
+#: watcher/db/purge.py:52
 msgid "Strategies"
 msgstr ""
 
-#: watcher/db/purge.py:52
+#: watcher/db/purge.py:53
 msgid "Audit Templates"
 msgstr ""
 
-#: watcher/db/purge.py:53
+#: watcher/db/purge.py:54
 msgid "Audits"
 msgstr ""
 
-#: watcher/db/purge.py:54
+#: watcher/db/purge.py:55
 msgid "Action Plans"
 msgstr ""
 
-#: watcher/db/purge.py:55
+#: watcher/db/purge.py:56
 msgid "Actions"
 msgstr ""
 
-#: watcher/db/purge.py:102
+#: watcher/db/purge.py:103
 msgid "Total"
 msgstr ""
 
-#: watcher/db/purge.py:160
+#: watcher/db/purge.py:166
 msgid "Audit Template"
 msgstr ""
 
-#: watcher/db/purge.py:227
+#: watcher/db/purge.py:233
 #, python-format
 msgid ""
 "Orphans found:\n"
 "%s"
 msgstr ""
 
-#: watcher/db/purge.py:306
+#: watcher/db/purge.py:312
 #, python-format
 msgid "There are %(count)d objects set for deletion. Continue? [y/N]"
 msgstr ""
 
-#: watcher/db/purge.py:313
+#: watcher/db/purge.py:319
 #, python-format
 msgid ""
 "The number of objects (%(num)s) to delete from the database exceeds the "
 "maximum number of objects (%(max_number)s) specified."
 msgstr ""
 
-#: watcher/db/purge.py:318
+#: watcher/db/purge.py:324
 msgid "Do you want to delete objects up to the specified maximum number? [y/N]"
 msgstr ""
 
-#: watcher/db/purge.py:408
+#: watcher/db/purge.py:414
 msgid "Deleting..."
 msgstr ""
 
-#: watcher/db/purge.py:414
+#: watcher/db/purge.py:420
 msgid "Starting purge command"
 msgstr ""
 
-#: watcher/db/purge.py:424
+#: watcher/db/purge.py:430
 msgid " (orphans excluded)"
 msgstr ""
 
-#: watcher/db/purge.py:425
+#: watcher/db/purge.py:431
 msgid " (may include orphans)"
 msgstr ""
 
-#: watcher/db/purge.py:428 watcher/db/purge.py:429
+#: watcher/db/purge.py:434 watcher/db/purge.py:435
 #, python-format
 msgid "Purge results summary%s:"
 msgstr ""
 
-#: watcher/db/purge.py:432
+#: watcher/db/purge.py:438
 #, python-format
 msgid "Here below is a table containing the objects that can be purged%s:"
 msgstr ""
 
-#: watcher/db/purge.py:437
+#: watcher/db/purge.py:443
 msgid "Purge process completed"
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:443
+#: watcher/db/sqlalchemy/api.py:477
 msgid "Cannot overwrite UUID for an existing Goal."
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:509
+#: watcher/db/sqlalchemy/api.py:543
 msgid "Cannot overwrite UUID for an existing Strategy."
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:586
+#: watcher/db/sqlalchemy/api.py:620
 msgid "Cannot overwrite UUID for an existing Audit Template."
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:683
+#: watcher/db/sqlalchemy/api.py:717
 msgid "Cannot overwrite UUID for an existing Audit."
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:778
+#: watcher/db/sqlalchemy/api.py:812
 msgid "Cannot overwrite UUID for an existing Action."
 msgstr ""
 
-#: watcher/db/sqlalchemy/api.py:891
+#: watcher/db/sqlalchemy/api.py:925
 msgid "Cannot overwrite UUID for an existing Action Plan."
 msgstr ""
 
+#: watcher/db/sqlalchemy/api.py:1004
+msgid "Cannot overwrite UUID for an existing efficacy indicator."
+msgstr ""
+
 #: watcher/db/sqlalchemy/migration.py:73
 msgid ""
 "Watcher database schema is already under version control; use upgrade() "
 "instead"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:94
+#: watcher/decision_engine/sync.py:106
 #, python-format
 msgid "Goal %s already exists"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:103
+#: watcher/decision_engine/sync.py:115
 #, python-format
 msgid "Strategy %s already exists"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:125
+#: watcher/decision_engine/sync.py:138
 #, python-format
 msgid "Goal %s created"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:154
+#: watcher/decision_engine/sync.py:167
 #, python-format
 msgid "Strategy %s created"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:180
+#: watcher/decision_engine/sync.py:193
 #, python-format
 msgid "Audit Template '%s' synced"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:225
+#: watcher/decision_engine/sync.py:238
 #, python-format
 msgid "Audit Template '%(audit_template)s' references a goal that does not exist"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:240
+#: watcher/decision_engine/sync.py:253
 #, python-format
 msgid ""
 "Audit Template '%(audit_template)s' references a strategy that does not "
 "exist"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:279
+#: watcher/decision_engine/sync.py:310
 #, python-format
 msgid "Goal %s unchanged"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:281
+#: watcher/decision_engine/sync.py:312
 #, python-format
 msgid "Goal %s modified"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:295
+#: watcher/decision_engine/sync.py:326
 #, python-format
 msgid "Strategy %s unchanged"
 msgstr ""
 
-#: watcher/decision_engine/sync.py:297
+#: watcher/decision_engine/sync.py:328
 #, python-format
 msgid "Strategy %s modified"
 msgstr ""
 
+#: watcher/decision_engine/goal/goals.py:34
+msgid "Dummy goal"
+msgstr ""
+
+#: watcher/decision_engine/goal/goals.py:62
+msgid "Unclassified"
+msgstr ""
+
+#: watcher/decision_engine/goal/goals.py:82
+msgid "Server consolidation"
+msgstr ""
+
+#: watcher/decision_engine/goal/goals.py:102
+msgid "Thermal optimization"
+msgstr ""
+
+#: watcher/decision_engine/goal/goals.py:122
+#: watcher/decision_engine/strategy/strategies/workload_stabilization.py:130
+msgid "Workload balancing"
+msgstr ""
+
+#: watcher/decision_engine/goal/efficacy/indicators.py:80
+msgid "Average CPU load as a percentage of the CPU time."
+msgstr ""
+
+#: watcher/decision_engine/goal/efficacy/indicators.py:95
+msgid ""
+"Represents the percentage of released nodes out of the total number of "
+"migrations."
+msgstr ""
+
+#: watcher/decision_engine/goal/efficacy/indicators.py:111
+msgid "The number of compute nodes to be released."
+msgstr ""
+
+#: watcher/decision_engine/goal/efficacy/indicators.py:125
+msgid "The number of migrations to be performed."
+msgstr ""
+
+#: watcher/decision_engine/goal/efficacy/specs.py:107
+msgid "Ratio of released compute nodes divided by the number of VM migrations."
+msgstr ""
+
 #: watcher/decision_engine/model/model_root.py:33
 #: watcher/decision_engine/model/model_root.py:38
 msgid "'obj' argument type is not valid"
 msgstr ""
 
-#: watcher/decision_engine/planner/default.py:78
+#: watcher/decision_engine/planner/default.py:80
 msgid "The action plan is empty"
 msgstr ""
 
+#: watcher/decision_engine/solution/efficacy.py:41
+msgid "An indicator value should be a number"
+msgstr ""
+
 #: watcher/decision_engine/strategy/selection/default.py:74
 #, python-format
 msgid "Could not load any strategy for goal %(goal)s"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/base.py:165
-msgid "Dummy goal"
-msgstr ""
-
-#: watcher/decision_engine/strategy/strategies/base.py:188
-msgid "Unclassified"
-msgstr ""
-
-#: watcher/decision_engine/strategy/strategies/base.py:204
-msgid "Server consolidation"
-msgstr ""
-
-#: watcher/decision_engine/strategy/strategies/base.py:220
-msgid "Thermal optimization"
-msgstr ""
-
-#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:119
+#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:117
 msgid "Basic offline consolidation"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:296
-#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:343
+#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:263
+#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:305
 #, python-format
 msgid "No values returned by %(resource_id)s for %(metric_name)s"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:456
+#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:414
 msgid "Initializing Sercon Consolidation"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:500
+#: watcher/decision_engine/strategy/strategies/basic_consolidation.py:456
 msgid "The workloads of the compute nodes of the cluster is zero"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/dummy_strategy.py:74
+#: watcher/decision_engine/strategy/strategies/dummy_strategy.py:78
 msgid "Dummy strategy"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:102
+#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:103
 msgid "Outlet temperature based strategy"
 msgstr ""
 
@@ -710,16 +777,20 @@ msgstr ""
 msgid "%s: no outlet temp data"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:181
+#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:180
 #, python-format
 msgid "VM not active, skipped: %s"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:239
+#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:186
+msgid "VM not found"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:235
 msgid "No hosts under outlet temp threshold found"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:262
+#: watcher/decision_engine/strategy/strategies/outlet_temp_control.py:255
 msgid "No proper target host could be found"
 msgstr ""
 
@@ -732,20 +803,68 @@ msgstr ""
 msgid "Unexpexted resource state type, state=%(state)s, state_type=%(st)s."
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:180
+#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:178
 #, python-format
 msgid "Cannot live migrate: vm_uuid=%(vm_uuid)s, state=%(vm_state)s."
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:264
+#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:262
 #, python-format
 msgid "No values returned by %(resource_id)s for memory.usage or disk.root.size"
 msgstr ""
 
-#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:515
+#: watcher/decision_engine/strategy/strategies/vm_workload_consolidation.py:519
 msgid "Executing Smart Strategy"
 msgstr ""
 
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:103
+msgid "workload balance migration strategy"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:152
+#, python-format
+msgid "VM not found Error: %s"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:157
+#, python-format
+msgid "VM not found from hypervisor: %s"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:233
+msgid "Can not get cpu_util"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:264
+msgid "Initializing Workload Balance Strategy"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:282
+#, python-format
+msgid ""
+"No hosts current have CPU utilization under %s percent, therefore there "
+"are no possible target hosts for any migration"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_balance.py:305
+msgid ""
+"No proper target host could be found, it might be because of there's no "
+"enough CPU/Memory/DISK"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_stabilization.py:173
+msgid "get_vm_load started"
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_stabilization.py:251
+#, python-format
+msgid "Incorrect mapping: could not find associated weight for %s in weight dict."
+msgstr ""
+
+#: watcher/decision_engine/strategy/strategies/workload_stabilization.py:371
+msgid "Initializing Workload Stabilization"
+msgstr ""
+
 #: watcher/objects/base.py:70
 #, python-format
 msgid "Error setting %(attr)s"
@@ -783,7 +902,7 @@ msgstr ""
 msgid "A datetime.datetime is required here"
 msgstr ""
 
-#: watcher/objects/utils.py:105
+#: watcher/objects/utils.py:114
 #, python-format
 msgid "An object of class %s is required here"
 msgstr ""