Add 'type:horizon-plugin' tag

Define a new deliverable type tag to describe deliverables that
are specifically meant to be loaded by Horizon to provide UI for
a given project.

Change-Id: If1adb5d30d215cf17e6bf72a46c8bbc33561d703

reference/projects.yaml

@@ -27,6 +27,7 @@ astara:
         - openstack/astara-horizon
       tags:
         - release:cycle-with-milestones
+        - type:horizon-plugin
     astara-neutron:
       repos:
         - openstack/astara-neutron
@@ -272,6 +273,7 @@ cloudkitty:
         - openstack/cloudkitty-dashboard
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
 
 Community App Catalog:
   ptl:
@@ -531,6 +533,7 @@ freezer:
         - openstack/freezer-web-ui
       tags:
         - release:independent
+        - type:horizon-plugin
     python-freezerclient:
       repos:
         - openstack/python-freezerclient
@@ -783,6 +786,7 @@ horizon:
         - openstack/horizon-cisco-ui
       tags:
         - release:independent
+        - type:horizon-plugin
     tempest-horizon:
       repos:
         - openstack/tempest-horizon
@@ -1953,6 +1957,7 @@ ironic:
         - openstack/ironic-ui
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
     ironic-webclient:
       repos:
         - openstack/ironic-webclient
@@ -2140,6 +2145,7 @@ magnum:
         - openstack/magnum-ui
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
     python-magnumclient:
       repos:
         - openstack/python-magnumclient
@@ -2188,6 +2194,7 @@ manila:
       tags:
         - release:cycle-with-intermediary
         - release:managed
+        - type:horizon-plugin
     python-manilaclient:
       repos:
         - openstack/python-manilaclient
@@ -2288,6 +2295,7 @@ monasca:
         - openstack/monasca-ui
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
     python-monascaclient:
       repos:
         - openstack/python-monascaclient
@@ -2360,6 +2368,7 @@ murano:
       tags:
         - release:cycle-with-milestones
         - stable:follows-policy
+        - type:horizon-plugin
     murano-deployment:
       repos:
         - openstack/murano-deployment
@@ -3818,6 +3827,7 @@ searchlight:
         - openstack/searchlight-ui
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
 
 Security:
   ptl:
@@ -3899,7 +3909,7 @@ senlin:
         - openstack/senlin-dashboard
       tags:
         - release:cycle-with-intermediary
-        - type:library
+        - type:horizon-plugin
 
 smaug:
   ptl:
@@ -3963,6 +3973,7 @@ solum:
         - openstack/solum-dashboard
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
     solum-infra-guestagent:
       repos:
         - openstack/solum-infra-guestagent
@@ -4304,6 +4315,7 @@ trove:
         - assert:follows-standard-deprecation
         - release:managed
         - release:cycle-with-milestones
+        - type:horizon-plugin
     trove-image-builder:
       repos:
         - openstack/trove-image-builder
@@ -4358,6 +4370,7 @@ vitrage:
         - openstack/vitrage-dashboard
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
 
 watcher:
   ptl:
@@ -4393,6 +4406,7 @@ watcher:
         - openstack/watcher-dashboard
       tags:
         - release:cycle-with-intermediary
+        - type:horizon-plugin
 
 winstackers:
   ptl:
@@ -4461,3 +4475,4 @@ zaqar:
         - openstack/zaqar-ui
       tags:
         - release:independent
+        - type:horizon-plugin

reference/tags/index.rst

@@ -43,6 +43,7 @@ Release Management Tags
    release_independent
    release_none
    release_managed
+   type_horizon-plugin
    type_library
    type_service
 

reference/tags/type_horizon-plugin.rst

@@ -0,0 +1,57 @@
+::
+
+  This work is licensed under a Creative Commons Attribution 3.0
+  Unported License.
+  http://creativecommons.org/licenses/by/3.0/legalcode
+
+.. _`tag-type:horizon-plugin`:
+
+=====================
+ type:horizon-plugin
+=====================
+
+This tag is part of the type-classification system for projects
+managed by the release team. ``type:horizon-plugin`` indicates that a
+deliverable is meant to be consumed by :ref:`project-horizon` as a
+plug-in, to provide an integrated web UI for a given project.
+
+
+Application to current projects
+===============================
+
+.. tagged-projects:: type:horizon-plugin
+
+
+Rationale
+=========
+
+On `releases.openstack.org`_ we group deliverables by their type. We have a
+growing number of projects that are Horizon plugins, and it would be useful
+to have them all appear together on the site. Using this tag will help users
+of both this site and the releases site identify which deliverables provide
+companion functionality for Horizon.
+
+
+Requirements
+============
+
+* The repository contains code meant to be dynamically loaded by
+  OpenStack Horizon to provide UI to specific projects.
+
+
+Tag application process
+=======================
+
+Anyone may propose adding or removing this tag to a set of projects by
+proposing a change to the openstack/governance repository. The change
+is reviewed by the Release Team and the Horizon PTL, and the Technical
+Committee finally approves it using its lazy consensus approval rule.
+
+
+Deprecation
+===========
+
+There is no deprecation process for tags in the ``type`` namespace. If
+we need to change the type of a project, we can just do that.
+
+.. _releases.openstack.org: http://releases.openstack.org/