I use Pingdom's 1-minute monitoring for this, which is included on the Free plan. No joke, it hits up my pseudo-cron Task Processing route which fires up and re

I use Pingdom's 1-minute monitoring for this, which is included on the Free plan. No joke, it hits up my pseudo-cron Task Processing route which fires up and reschedules all tasks needing doing, and it never fails. And it provides uptime and failure reports on my scheduled tasks!