[VOL-5252] Update release matrix for repo:voltha-openonu-adapter-go

release_notes/voltha_2.12.rst
-----------------------------
  o Update release matrix with onu-adapter-go artifact and chart version.

howto/release/tasks/charts.rst
------------------------------
  o Create an anchored document for chart editing.
  o This common document can then be referenced by per-repo chart edit docs.

howto/release/charts/notes.rst
howto/release/charts/voltha-openolt-adapter.rst
howto/release/charts/voltha-openonu-adapter.rst
-----------------------------------------------
  o Document edits for openonu.
  o Re-arrange some of the content.

howto/code/index.rst
howto/code/lint/
howto/code/linting.rst
----------------------
  o Move help topics lint-chart and lint-helm into an individual rst file.
  o This helps support creation of an anchor for document linking.

Change-Id: I03bf4742a3ce8075c93827004466f9c1d7408859
diff --git a/howto/release/charts/notes.rst b/howto/release/charts/notes.rst
index b1a4f20..1851adb 100644
--- a/howto/release/charts/notes.rst
+++ b/howto/release/charts/notes.rst
@@ -6,7 +6,7 @@
 
   - For release remove all version decorations: -dev, -SNAPSHOT
 
-- Release job will `publish to <https://gerrit.opencord.org/plugins/gitiles/cord-charts-repo/+/refs/heads/master>`_.
+- Release job will publish to `cord-charts-repo <https://gerrit.opencord.org/plugins/gitiles/cord-charts-repo/+/refs/heads/master>`_.
 
 - lint/syntax checking
 
@@ -18,5 +18,3 @@
 ----
 
 - Update ONOS components `voltha-infra/values.yaml <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-infra/values.yaml>`_
-
-
diff --git a/howto/release/charts/voltha-openolt-adapter.rst b/howto/release/charts/voltha-openolt-adapter.rst
index 86de231..e3aeb73 100644
--- a/howto/release/charts/voltha-openolt-adapter.rst
+++ b/howto/release/charts/voltha-openolt-adapter.rst
@@ -2,15 +2,8 @@
 
 ## HOWTO: Helm Chart Update
 
-.. code-block:: shell-session
-   :caption: Cookbook of edits
-
-   % git clone "ssh://gerrit.opencord.org:29418/voltha-helm-charts.git"
-   % cd voltha-helm-charts
-   % vi $(grep -r 'adapter' . | cut -d: -f1 | sort -u)
-
-   % make lint-chart
-   % make lint-helm
+- Update copyright notices :ref:`Release Task Copyright`
+- Update VOLTHA artifact and chart versions :ref:`Release Task Helm Charts`
 
 - Increment repository `VERSION file <https://gerrit.opencord.org/plugins/gitiles/voltha-openolt-adapter/+/refs/heads/master/VERSION>`_.  Build, test and deploy.
 - Modify repo:voltha-helm-charts
@@ -42,9 +35,12 @@
    * - `voltha-adapter-openolt/Chart.yaml <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openolt/Chart.yaml>`_
      - Chart.yaml : appVersion
      - Assign `repo:voltha-openolt-adapter::VERSION <https://gerrit.opencord.org/plugins/gitiles/voltha-openolt-adapter/+/refs/heads/master/VERSION>`_ to `Chart.yaml::appVersion <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openolt/Chart.yaml#35>`_
+   * - `voltha-adapter-openolt/Chart.yaml <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openolt/Chart.yaml>`_
+     - Chart.yaml : version
+     - Increment `OLT chart version <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openolt/Chart.yaml#20>`_
    * - voltha-infra/Chart.yaml
      -
-     -
+     - N/A
    * - voltha-stack/Chart.yaml
      - dependencies : name=voltha-adapter-openolt :  version
      - Component openolt-adapter modified so update `dependencies : name='voltha-adapter-olt' : version="2.12.6" <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-stack/Chart.yaml#38>`_
@@ -63,8 +59,7 @@
 
 ### Extra Credit
 
-- Update copyright notices :ref:`Release Task Copyright`
-- make lint # lint everything
+- make lint
 
 .. seealso::
 
diff --git a/howto/release/charts/voltha-openonu-adapter.rst b/howto/release/charts/voltha-openonu-adapter.rst
new file mode 100644
index 0000000..bd4ad85
--- /dev/null
+++ b/howto/release/charts/voltha-openonu-adapter.rst
@@ -0,0 +1,68 @@
+# Update Helm Chart for repo:votlha-openonu-adapter
+
+## HOWTO: Helm Chart Update
+
+- Update copyright notices :ref:`Release Task Copyright`
+- Update VOLTHA artifact and chart versions :ref:`Release Task Helm Charts`
+
+- Increment repository `VERSION file <https://gerrit.opencord.org/plugins/gitiles/voltha-openonu-adapter/+/refs/heads/master/VERSION>`_.  Build, test and deploy.
+- Modify repo:voltha-helm-charts
+
+  - Update component version in the component chart file.
+  - Update chart version for all charts dependent on the component chart.
+  - Run ``make lint-chart lint-helm`` to validate chart changes.
+  - chart:voltha, chart:voltha-infra and chart:voltha-stack can be confusing
+    due to a layer of indirection:
+
+    - chart:voltha-{infra,stack} are not not named for code repositories,
+      they are a container chart used to capture a list of dependencies
+      and versions.
+    - chart:voltha depends on these two charts which in turn depend on
+      sets of voltha components & versions.
+    - When ``make lint-chart`` report this error
+
+      - [ERROR] Chart modified but version unchanged: voltha/Chart.yaml (2.12.11)
+      - It will imply that a component like openonu-adapter has been updated
+        but chart:voltha and chart:voltha-{infra,stack} have not.
+
+.. list-table:: repo:voltha-helm-charts edits
+   :widths: 10, 20, 60
+   :header-rows: 1
+
+   * - Repository Path
+     - Key
+     - Description
+   * - `voltha-adapter-openonu/Chart.yaml <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openonu/Chart.yaml>`_
+     - Chart.yaml : appVersion
+     - Assign `repo:voltha-openonu-adapter::VERSION <https://gerrit.opencord.org/plugins/gitiles/voltha-openonu-adapter/+/refs/heads/master/VERSION>`_ to `Chart.yaml::appVersion <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openonu/Chart.yaml#35>`_
+   * - `voltha-adapter-openonu/Chart.yaml <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openonu/Chart.yaml>`_
+     - Chart.yaml : version
+     - Increment `ONU chart version <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-adapter-openonu/Chart.yaml#17>`_
+
+   * - voltha-infra/Chart.yaml
+     -
+     -
+   * - voltha-stack/Chart.yaml
+     - dependencies : name=voltha-adapter-openonu :  version
+     - Component openonu-adapter modified so update `dependencies : name='voltha-adapter-onu' : version="2.12.2" <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-stack/Chart.yaml#38>`_
+   * - voltha-stack/Chart.yaml
+     - Chart.yaml : version
+     - voltha-adapter-openonu/Chart.yaml modified so notify voltha-stack. Update `version="2.12.2" <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-stack/Chart.yaml#30>`_.
+   * - voltha-stack/Chart.yaml
+     - dependency : name=voltha : version
+     - voltha-stack/Chart.yaml modified so notify chart voltha.  Update `dependencies : name=voltha : version="2.12.14" <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha-stack/Chart.yaml#34>`_
+   * - voltha/Chart.yaml
+     - Chart.yaml : version
+     - voltha/Chart.yaml updated so modify chart `Chart.yaml : version='"2.12.14"' <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha/Chart.yaml#17>`_
+   * - voltha/Chart.yaml
+     - Chart.yaml : version
+     - Update `voltha/Chart.yaml : version='"2.12.14"' <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha/Chart.yaml#17>`_ to match `voltha-stack:dependencies : name=voltha : version='"2.12.14"' <https://gerrit.opencord.org/plugins/gitiles/voltha-helm-charts/+/refs/heads/master/voltha/Chart.yaml#17>`_.
+
+### Extra Credit
+
+- Update copyright notices :ref:`Release Task Copyright`
+- make lint # lint everything
+
+.. seealso::
+
+`voltha-docs::charts <../charts/index>`
diff --git a/howto/release/tasks/charts.rst b/howto/release/tasks/charts.rst
new file mode 100644
index 0000000..c6b70aa
--- /dev/null
+++ b/howto/release/tasks/charts.rst
@@ -0,0 +1,21 @@
+.. _Release Task Helm Charts:
+
+Helm Chart Update
+=================
+
+.. code-block:: shell-session
+   :caption: Update helm charts for deployed VOLTHA and ONOS artifacts
+
+   # clone repo:voltha-helm-charts
+   % git clone "ssh://gerrit.opencord.org:29418/voltha-helm-charts.git"
+   % cd voltha-helm-charts
+
+   # Gather files to edit
+   % vi $(grep -r 'adapter' . | cut -d: -f1 | sort -u)
+
+   # Gather indirect dependencies to edit
+   vi voltha/Chart.yaml voltha-infra/Chart.yaml voltha-stack/Chart.yaml
+
+   # Sanity check edits
+   % make lint-chart
+   % make lint-helm