Is there any way to view the Alert Routing for all resources and websites?

Nothing like this that I know of. You’d basically have to hit every datapoint on every instance. It would be nice to have a capability on the alert rules page to do a “dry run” of all alerts in the last X hours to see which alerts would have gone to which rules. That would get you close, but not exactly what you’re asking for.

FWIW: our catch all sends to our main ticketing queue so we’re not as concerned about it.