Healthchecks.io -- Cron job monitoring
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"Healthchecks.io monitoring is a great fit for cron jobs and cron-like systems (systemd timers, Jenkins build jobs, Windows Scheduled Tasks, wp-cron, uwsgi cron-like interface, Heroku Scheduler, ...). A failed cron job often has no immediate visible consequences, and can go unnoticed for a long time."
https://healthchecks.io
https://github.com/healthchecks/healthchecks