Spec for xenapi support

Change-Id: I413d9c786dd39d67e2770701340fe5da6e1b0d27

specs/juno/xenapi-support.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
+
+==========================================
+XenAPI support
+==========================================
+
+https://blueprints.launchpad.net/ceilometer/+spec/xenapi-support
+
+Currently ceilometer can support libvirt, hyperv and vmware hypervisor.
+And now it is necessary to add xenapi inspector for XenServer/Xen Cloud
+Platform.
+
+Problem description
+===================
+
+The usecase is to use xenapi to inspect the XenServer hypervisor.
+
+Proposed change
+===============
+
+Create xenapi directory in ceilometer/compute/virt, and implement
+xenapi inspector to support all existing meters.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+None
+
+Security impact
+---------------
+
+None
+
+Pipeline impact
+---------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance/Scalability Impacts
+-------------------------------
+
+None
+
+Other deployer impact
+---------------------
+
+The deployer can now optionally define connection information to
+XenServer/Xen Cloud Platform by adding::
+
+    [xenapi]
+    connection_url =
+    connection_username =
+    connection_password =
+
+Developer impact
+----------------
+
+None
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  * qiaowei-ren
+
+Ongoing maintainer:
+  * qiaowei-ren
+
+Work Items
+----------
+
+* Implement xenapi inspector for XenServer/Xen Cloud Platform.
+* Test method in unit tests
+
+Future lifecycle
+================
+
+None
+
+Dependencies
+============
+
+None
+
+Testing
+=======
+
+Unit Tests will be added to cover the necessary inspector calls.
+
+Documentation Impact
+====================
+
+The Measurement docs need to be updated to reflect xenapi support.
+
+References
+==========
+
+XenAPI Documentation: http://docs.vmd.citrix.com/XenServer/6.2.0/1.0/en_gb/api/
+