Alerts for failing triggers

I tried creating a project alert for ‘Triggers’ where the condition is “A Trigger has failed and cannot be restarted”. I have a scheduled trigger (cron job based) for which i would like to be alerted on slack when it fails. I set the trigger function (the function that executes on the trigger event) to deliberately fail by throwing an exception.

The trigger indeed fails when scheduled for execution but no alert is raised (neither on the alert dashboard and by extension, nothing gets sent to slack).

Is the mere failure of the trigger function not sufficient to trigger the alert? If so, what methods can we configure to be alerted when a trigger function fails?