Heartbeat monitoring: know when your scheduled jobs silently stop working

Uptime monitoring tells you when your server goes down. But some of the worst outages look like this: The server is fine The cron scheduler fired Nothing visibly broke The job just quietly stopped doing anything useful. A nightly data sync that hasn't run in four days. A backup that "completed" but wrote zero bytes. A report job that started silently throwing exceptions three weeks ago. These failures are invisible to a traditional HTTP monitor because the endpoint never went down. This is what