Queue should push event when job failed, even when PHP crashed

[roelvanduijnhoven]

There is currently no way to hook into an event that can tell you whenever a job failed reliably. When a job crashes / exits / dies during executing a requests, it will remain on status busy.

Ideally there would be a system in place that can detect this, and that should broadcast an error event.

Maybe this should / could be fixed on the SlmQueue level.