Merge "Update docs structure according to new guidelines in https://wiki.opnfv.org/display/DOC"

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+.. This work is licensed under a Creative Commons Attribution 4.0 International License.
+.. http://creativecommons.org/licenses/by/4.0
+
+Doctor capabilities and usage
+=============================
+Immediate Notification
+----------------------
+
+Immediate notification can be used by creating 'event' type alarm via
+OpenStack Alarming (Aodh) API with relevant internal components support.
+
+See, upstream spec document:
+http://specs.openstack.org/openstack/ceilometer-specs/specs/liberty/event-alarm-evaluator.html
+
+An example of a consumer of this notification can be found in the Doctor
+repository. It can be executed as follows:
+
+.. code-block:: bash
+
+    git clone https://gerrit.opnfv.org/gerrit/doctor -b stable/danube
+    cd doctor/tests
+    CONSUMER_PORT=12346
+    python consumer.py "$CONSUMER_PORT" > consumer.log 2>&1 &
+
+Consistent resource state awareness
+-----------------------------------
+
+Resource state of compute host can be changed/updated according to a trigger
+from a monitor running outside of OpenStack Compute (Nova) by using
+force-down API.
+
+See
+http://artifacts.opnfv.org/doctor/danube/manuals/mark-host-down_manual.html
+for more detail.
+
+Valid compute host status given to VM owner
+-------------------------------------------
+
+The resource state of a compute host can be retrieved by a user with the
+OpenStack Compute (Nova) servers API.
+
+See
+http://artifacts.opnfv.org/doctor/danube/manuals/get-valid-server-state.html
+for more detail.