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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+===========================================
+Define when an action plan is stale/invalid
+===========================================
+
+https://blueprints.launchpad.net/watcher/+spec/stale-action-plan
+
+Problem description
+===================
+
+When an audit is created and launched successfully, it generates a new
+action plan with status **RECOMMENDED**. If the cluster data model has changed
+by and by, the action plan still remains in the **RECOMMENDED** state. There is
+not an expiry date or event that can invalidate the action plan so far.
+
+It should be possible to add a new **SUPERSEDED** state for action plan.
+
+Use Cases
+----------
+
+As a Watcher Administrator, I want watcher to update the state of any action
+plan from **RECOMMENDED** to **SUPERSEDED** automatically if the action plan
+has expired (default expiry time: 24 hours).
+
+As a Watcher Administrator, after the recommended action plan is launched
+successfully, I want watcher to update the state of any action plan based on
+the same cluster data model from **RECOMMENDED** to **SUPERSEDED**
+automatically.
+
+As a Watcher Administrator, when the cluster data model changes, I want watcher
+to update the state of action plan based on this cluster data model from
+**RECOMMENDED** to **SUPERSEDED** automatically.
+
+Project Priority
+-----------------
+
+None
+
+Proposed change
+===============
+
+* Add a new state **SUPERSEDED** for the **Action Plan**.
+* Add a new config parameter **action_plan_expiry**, This parameter is
+  used to set the time interval for checking the state of action plan.
+  Its type is Integer and the value is **24** (hours) by default.
+* Add a new **CheckActionplanState** class. In this class we use the
+  **APScheduler** library to check the state of action plan periodically.
+  **APScheduler** is a Python library that can schedule a job to be executed
+  later, either just once or periodically. It has been used in the continuous
+  audits, we just add our new job in the scheduler. The interval of the
+  periodic job is configurable.
+* Modify the **DefaultActionPlanHandler** class, trigger to check the state
+  of action plan.
+* Currently, when receives the specific event (such as nova notification
+  event_type:service.update, instance.update, instance.delete.end), the
+  decision engine will update the cluster data model. We need to add the state
+  of action plan updates to this process. To identify the action plan affected
+  by the cluster data model change, we distinguish by **audit.scope** field.
+  Only when the cluster data in the audit scope has changed, we update the
+  state of action plan. If audit.scope is null, we still update the state of
+  action plan when any cluster data is changed.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  <licanwei>
+
+Work Items
+----------
+
+Here is the list of foreseen work items:
+
+* Add a **SUPERSEDED** state to the class **State** in the file
+  **watcher/objects/action_plan.py**.
+* Update the **DefaultActionPlanHandler** class in **watcher/applier/
+  action_plan/default.py**.
+* Add a **manager.py** file to the **watcher/common** folder.
+* Add check_state code in the file **watcher/decision_engine/scheduling.py**.
+* Add check_state code in the file **watcher/decision_engine/model/
+  notification/nova.py**.
+
+Dependencies
+============
+
+https://blueprints.launchpad.net/watcher/+spec/define-the-audit-scope
+
+Testing
+=======
+
+The unit tests will have to be updated.
+
+Documentation Impact
+====================
+
+Need to update the **Action Plan State Machine** in the architecture
+documentation.
+
+References
+==========
+
+None
+
+History
+=======
+
+None
+