Spec for Mistral integration

Change-Id: Iae83cc990b771f733533310f931b5a4d370e103c
Implements: blueprint integration-with-mistral

specs/pike/approved/integration-with-mistral.rst

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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
+
+========================
+Integration with Mistral
+========================
+
+launchpad blueprint:
+https://blueprints.launchpad.net/vitrage/+spec/integration-with-mistral
+
+Support executing Mistral workflows from Vitrage.
+
+Problem description
+===================
+
+Vitrage provides insights about the state of the cloud, but is not meant to be
+a policy engine. In order to take corrective actions, for example, we need to
+integrate an external engine like Mistral - the OpenStack workflow engine.
+
+Proposed change
+===============
+
+It will be possible to define in Vitrage templates that under certain
+conditions, a Mistral workflow should be executed. This gives the user the
+power to decide, for example, that different corrective actions should be taken
+based on the root cause of the problem (as identified by Vitrage).
+
+Note that this blueprint is based on the external-actions blueprint, that
+handles the more general case.
+
+Examples
+--------
+
+.. code-block:: yaml
+
+ - scenario:
+    condition: host_down_alarm_on_host
+    actions:
+     - action:
+        action_type: execute_mistral
+        properties:
+         workflow: wf1
+
+
+Alternatives
+------------
+Discussed in the external-actions blueprint.
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Versioning impact
+-----------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Deployer impact
+---------------
+
+None
+
+Developer impact
+----------------
+
+None
+
+Horizon impact
+--------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+ifat-afek
+
+Work Items
+----------
+
+* Implement the Mistral notifier
+* Update the documentation
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+The implementation will be covered by unit tests and tempest tests.
+
+Documentation Impact
+====================
+
+The new action should be documented
+
+References
+==========
+
+None