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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
+
+========================================================================
+Adding new nova-manage cmd to list compute node metrics
+========================================================================
+
+https://blueprints.launchpad.net/nova/+spec/compute-node-metrics-api
+
+We need a way to list the available metrics stored in the DB
+which is reported by the compute monitor plugins, so the administrator
+can easily configure the scheduler's MetricWeigher settings.
+
+Problem description
+===================
+
+With the Icehouse blueprint implementation
+https://blueprints.launchpad.net/nova/+spec/utilization-aware-scheduling,
+now various monitor plug-ins can be configured to report hypervisor
+metrics periodically. These metrics could be used in scheduling process
+through the MetricsWeigher configured by the administrator.
+
+When the administrator wants to configure the settings for MetricsWeigher,
+he/she need to know the exact metrics to make the settings working
+properly. Currently, we don't have a way to let the administrator know what
+metrics are available unless asking the administrator to look at the monitor
+plug-ins code or looking in certain DB tables.
+
+We need a way to list the available metrics currently reported
+by the nova compute monitors and stored in the DB, so the administrator
+can configure the MetricWeigher much more easily.
+
+Use Cases
+----------
+
+The Administrator will use this way to list all the available metric names,
+in order to configure the MetricsWeigher to work as expected.
+
+Project Priority
+-----------------
+
+None
+
+Proposed change
+===============
+
+A new nova-manage command will be added::
+
+    nova-manage host_metric [--host=<host>] { list | show }
+
+This command will load the information from nova DB about all the available
+compute node metrics stored there. The 'list' action will list all the
+available compute node metrics name, and the 'show' action will show all
+the details of each metric.
+
+Alternatives
+------------
+
+One alternative is to add a new method in
+nova.compute.monitors.base.MonitorBase class that would return a list of
+the metric names that each plugin supports.
+
+A new top-level REST API resource will be added, it simply lists the metric
+names which are returned by the new method mentioned above::
+
+    GET /v2.1/host-metrics
+
+A array 'metrics' will be returned in the response of this API, listing
+all the metrics names. The response will looks like::
+
+    200 OK
+    {
+        "host_metrics": [
+            'cpu.kernel.time',
+            'cpu.user.time',
+            ......
+        ]
+    }
+
+This new API by default is admin only.
+
+Another alternative is to extend the current os-hypervisors API extension which
+list all the information about the compute node hypervisor. It pulls the
+information from the DB, but it ignores the metrics related information.
+
+We need to modified the os-hypervisors API extension to list the metrics
+of each compute node hypervisor through the following restful API call::
+
+    GET /v2.1/os-hypervisors/{hypervisor_id}/metrics
+
+The above API would query the DB and return the metrics stored in the DB
+for the specified compute node hypervisor.
+
+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:
+  lianhao-lu
+
+Other contributors:
+  None
+
+Work Items
+----------
+
+* add new nova-manage command
+
+
+Dependencies
+============
+
+https://review.openstack.org/#/q/project:openstack/nova+branch:master+topic:bug/1468012,n,z
+
+
+Testing
+=======
+
+New unit test cases will be added.
+
+Documentation Impact
+====================
+
+The admin configuration documentation need to be updated.
+
+
+References
+==========
+
+None
+