[pbs-devel] [PATCH proxmox-backup] docs: notifications: add section about how to use custom templates

[Lukas Wagner]

This section is meant to give a basic overview on how to use
custom templates for notifications. It will be expanded in the
future, providing a more detailed view on how templates are resolved,
existing fallback mechanisms, available templates, template
variables and helpers.

Signed-off-by: Lukas Wagner <l.wagner at proxmox.com>
---
 docs/notifications.rst | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/docs/notifications.rst b/docs/notifications.rst
index 34fc0128..7cd4d229 100644
--- a/docs/notifications.rst
+++ b/docs/notifications.rst
@@ -362,3 +362,25 @@ type via the ``notify`` option.
 
 The ``notify-user`` and ``notify`` options are ignored if ``notification-mode``
 is set to ``notification-system``.
+
+Overriding Notification Templates
+---------------------------------
+
+Proxmox Backup Server uses Handlebars templates to render notifications. 
+The original templates provided by Proxmox Backup Server are stored in
+``/usr/share/proxmox-backup/templates/default/``.
+
+Notification templates can be overridden by providing a custom template
+file in the override directory at 
+``/etc/proxmox-backup/notification-templates/default/``.
+When rendering a notification of a given type, Proxmox Backup Server
+will first attempt to load a template from the override directory.
+If this one does not exist or fails to render, the original template
+will be used.
+
+The template files follow the naming convention of
+``<type>-<body|subject>.txt.hbs``. For instance, the file
+``gc-err-body.txt.hbs`` contains the template for rendering notifications
+for garbage collection errors, while ``package-updates-subject.txt.hbs``
+is used to render the subject line of notifications for available package
+updates.
-- 
2.39.5