This commit adds a way to filter notifications based on severity. The
filter module also has the necessary foundation work for more complex
filters, e.g. matching on properties or for creating arbitarily complex
filter structures using nested sub-filters.
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
Add an endpoint for Gotify [1], showing the how easy it is to add new
endpoint implementations.
[1] https://gotify.net/
Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
