[pbs-devel] [PATCH proxmox-backup 1/2] docs: document notification-mode and merge old notification section

[Lukas Wagner]

This new section describes how the notification-mode parameter works.
The section also contains also parts of the old notification section
from the maintenance chapter, reusing the description of the
`notify` and `notify-user` parameters.

Signed-off-by: Lukas Wagner <l.wagner at proxmox.com>
---
 docs/maintenance.rst   | 26 --------------------------
 docs/notifications.rst | 42 ++++++++++++++++++++++++++++++++++++++++++
 docs/storage.rst       |  4 ++--
 3 files changed, 44 insertions(+), 28 deletions(-)

diff --git a/docs/maintenance.rst b/docs/maintenance.rst
index 6dbb6941..1dd17ad0 100644
--- a/docs/maintenance.rst
+++ b/docs/maintenance.rst
@@ -272,32 +272,6 @@ datastores, backup groups or snapshots. To do this, navigate to the **Content**
 tab of the datastore and either click *Verify All* or select the *V.* icon from
 the **Actions** column in the table.
 
-.. _maintenance_notification:
-
-Notifications
--------------
-
-Proxmox Backup Server can send you notification emails about automatically
-scheduled verification, garbage-collection and synchronization tasks results.
-
-By default, notifications are sent to the email address configured for the
-`root at pam` user. You can instead set this user for each datastore.
-
-.. image:: images/screenshots/pbs-gui-datastore-options.png
-  :target: _images/pbs-gui-datastore-options.png
-  :align: right
-  :alt: Datastore Options
-
-You can also change the level of notification received per task type, the
-following options are available:
-
-* Always: send a notification for any scheduled task, independent of the
-  outcome
-
-* Errors: send a notification for any scheduled task that results in an error
-
-* Never: do not send any notification at all
-
 .. _maintenance_mode:
 
 Maintenance Mode
diff --git a/docs/notifications.rst b/docs/notifications.rst
index 4f9b01b7..e5ec74b7 100644
--- a/docs/notifications.rst
+++ b/docs/notifications.rst
@@ -211,3 +211,45 @@ Permissions
 In order to modify/view the configuration for notification targets,
 the ``Sys.Modify/Sys.Audit`` permissions are required for the
 ``/system/notifications`` ACL node.
+
+.. _notification_mode:
+
+Notification Mode
+-----------------
+
+To ensure a smooth transition from the old, purely email based system to
+the new configurable notification system introduced in Proxmox Backup Server 3.2,
+datastore options, tape backup jobs and tape restore jobs gain a new option:
+``notification-mode``. This option must be set to ``notification-system``
+to opt in to the new notification system. If the option is not set, or
+set to ``legacy-sendmail``, Proxmox Backup Server will use the old
+system.
+
+Starting with Proxmox Backup Server 3.2, a datastore created in the UI will
+automatically opt in to the new notification system. If the datastore is created
+via the API or the ``proxmox-backup-manager`` CLI, the ``notification-system``
+option has to be set explicitly.
+
+The ``legacy-sendmail`` mode will be deprecated and removed in a later
+release of Proxmox Backup Server.
+
+Settings for ``legacy-sendmail`` notification mode
+^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+If ``notification-mode`` is set to ``legacy-sendmail``,  Proxmox Backup Server
+will send notification emails via the system's ``sendmail`` command to the email
+address configured for the user set in the ``notify-user`` option
+(falling back to ``root at pam`` if not set)
+
+For datastores, you can also change the level of notification received per task
+type via the ``notify`` option.
+
+* Always: send a notification for any scheduled task, independent of the
+  outcome
+
+* Errors: send a notification for any scheduled task that results in an error
+
+* Never: do not send any notification at all
+
+The ``notify-user`` and ``notify`` options are ignored if ``notification-mode``
+is set to ``notification-system``.
diff --git a/docs/storage.rst b/docs/storage.rst
index 4444c423..f1e15d52 100644
--- a/docs/storage.rst
+++ b/docs/storage.rst
@@ -314,7 +314,7 @@ Options
 
 There are a few per-datastore options:
 
-* :ref:`Notifications <maintenance_notification>`
+* :ref:`Notification mode and legacy notification settings <notification_mode>`
 * :ref:`Maintenance Mode <maintenance_mode>`
 * Verification of incoming backups
 
@@ -419,7 +419,7 @@ remote-source to avoid that an attacker that took over the source can cause
 deletions of backups on the target hosts.
 If the source-host became victim of a ransomware attack, there is a good chance
 that sync jobs will fail, triggering an :ref:`error notification
-<maintenance_notification>`.
+<Notification Events>`.
 
 It is also possible to create :ref:`tape backups <tape_backup>` as a second
 storage medium. This way, you get an additional copy of your data on a
-- 
2.39.2