
healthchecks.io
Monitor cron jobs and get notified when they fail. For each job you want to monitor, you create a "check" on healthchecks.io website. Each check has an unique "ping" URL. Whenever you access this URL, the "Last Ping" value of corresponding check is updated. When a certain (configurable) amount of time passes since last received ping, the check is considered "late", and healthchecks.io sends an email alert.