Add a guide to add a new microversion support

Add a contributor guide for adding a new microversion support.

Change-Id: I5e7699b6afbecf1e22cdc059a36832c144fc8e2f

doc/source/conf.py

@@ -80,6 +80,7 @@ bug_project = 'python-novaclient'
 bug_tag = ''
 openstack_projects = [
     'keystoneauth',
+    'nova',
     'os-client-config',
     'python-openstackclient',
 ]

doc/source/contributor/index.rst

@@ -13,4 +13,5 @@ __ https://docs.openstack.org/infra/manual/developers.html#development-workflow
 .. toctree::
    :maxdepth: 2
 
+   microversions
    testing

doc/source/contributor/microversions.rst

@@ -0,0 +1,71 @@
+=====================================
+Adding support for a new microversion
+=====================================
+
+If a new microversion is added on the nova side,
+then support must be added on the *python-novaclient* side also.
+The following procedure describes how to add support for a new microversion
+in *python-novaclient*.
+
+#. Update ``API_MAX_VERSION``
+
+   Set ``API_MAX_VERSION`` in ``novaclient/__init__.py`` to the version
+   you are going to support.
+
+   .. note::
+
+     Microversion support should be added one by one in order.
+     For example, microversion 2.74 should be added right after
+     microversion 2.73. Microversion 2.74 should not be added right
+     after microversion 2.72 or earlier.
+
+#. Update CLI and Python API
+
+   Update CLI (``novaclient/v2/shell.py``) and/or Python API
+   (``novaclient/v2/*.py``) to support the microversion.
+
+#. Add tests
+
+   Add unit tests for the change. Add unit tests for the previous microversion
+   to check raising an error or an exception when new arguments or parameters
+   are specified. Add functional tests if necessary.
+
+   Add the microversion in the ``exclusions`` in the ``test_versions``
+   method of the ``novaclient.tests.unit.v2.test_shell.ShellTest`` class
+   if there are no versioned wrapped shell method changes
+   for the microversion.
+
+   For example (microversion 2.72 example)::
+
+     exclusions = set([
+         (snipped...)
+         72,  # There are no version-wrapped shell method changes for this.
+     ])
+
+#. Update the CLI reference
+
+   Update the CLI reference (``doc/source/cli/nova.rst``)
+   if the CLI commands and/or arguments are modified.
+
+#. Add a release note
+
+   Add a release note for the change. The release note should include a link
+   to the description for the microversion in the
+   :nova-doc:`Compute API Microversion History
+   <reference/api-microversion-history>`.
+
+#. Commit message
+
+   The description of the blueprint and dependency on the patch in nova side
+   should be added in the commit message. For example::
+
+     Implements: blueprint remove-force-flag-from-live-migrate-and-evacuate
+     Depends-On: https://review.opendev.org/#/c/634600/
+
+See the following examples:
+
+- `Microversion 2.71 - show server group <https://review.opendev.org/#/c/640657/>`_
+- `API microversion 2.69: Handles Down Cells <https://review.opendev.org/#/c/579563/>`_
+- `Microversion 2.68: Remove 'forced' live migrations, evacuations <https://review.opendev.org/#/c/635131/>`_
+- `Add support changes-before for microversion 2.66 <https://review.opendev.org/#/c/603549/>`_
+- `Microversion 2.64 - Use new format policy in server group <https://review.opendev.org/#/c/578261/>`_