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Merge "Add reference to Ceilometer developer guide"

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2016-01-22 16:48:26 +00:00
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doc/source/dev/strategy-plugin.rst
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@@ -128,13 +128,27 @@ check/configure the latter so your new strategy can be fully functional.
Querying metrics Querying metrics
---------------- ----------------
The metrics available depend on the hypervisors that OpenStack manages on A large set of metrics, generated by OpenStack modules, can be used in your
the specific implementation. You can find the metrics available per hypervisor strategy implementation. To collect these metrics, Watcher provides a
and OpenStack release on the OpenStack site. `Helper`_ to the Ceilometer API, which makes this API reusable and easier
to used.
There are different possible ways to obtain usage metrics in Watcher, you can If you want to use your own metrics database backend, please refer to the
use the default Ceilometer API or our Helper. `Ceilometer developer guide`_. Indeed, Ceilometer's pluggable model allows
The Helper attempted to make the Ceilometer API more reusable and easy to use. for various types of backends. A list of the available backends is located
here_. The Ceilosca project is a good example of how to create your own
pluggable backend.
Finally, if your strategy requires new metrics not covered by Ceilometer, you
can add them through a Ceilometer `plugin`_.
.. _`Helper`: https://github.com/openstack/watcher/blob/master/watcher/metrics_engine/cluster_history/ceilometer.py#L31
.. _`Ceilometer developer guide`: http://docs.openstack.org/developer/ceilometer/architecture.html#storing-the-data
.. _`here`: http://docs.openstack.org/developer/ceilometer/install/dbreco.html#choosing-a-database-backend
.. _`plugin`: http://docs.openstack.org/developer/ceilometer/plugins.html
.. _`Ceilosca`: https://github.com/openstack/monasca-ceilometer/blob/master/ceilosca/ceilometer/storage/impl_monasca.py
Read usage metrics using the Python binding Read usage metrics using the Python binding
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