I checked this command
/usr/lib64/nagios/plugins/icinga2-mattermost/mattermost.py --url https://example.com/hooks/xxxxxxxxxx --channel icinga2 --notificationtype "some-alarm" --hostalias test
And I get a notification
I checked this command
/usr/lib64/nagios/plugins/icinga2-mattermost/mattermost.py --url https://example.com/hooks/xxxxxxxxxx --channel icinga2 --notificationtype "some-alarm" --hostalias test
And I get a notification