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Last tested: Nov 7, 2020
Using System Activity you can tell if a scheduled report was successfully sent. Schedule this System Activity explore as an hourly report, by adding the Advanced Send this schedule if there are results and you'll be notified if another schedule failed.
https://[HOSTNAME]/explore/system__activity/scheduled_plan?fields=scheduled_job.created_date,scheduled_job.status_detail,scheduled_job.status,dashboard.title,look.title,scheduled_plan_destination.address&f[scheduled_plan.run_once]=No&f[scheduled_job.created_date]=1+days&f[scheduled_job.status]=failure&sorts=scheduled_job.status_detail&limit=500&column_limit=50&query_timezone=America%2FLos_Angeles&vis=%7B%22hidden_fields%22%3A%5B%22scheduled_job.status%22%5D%7D&filter_config=%7B%22scheduled_plan.run_once%22%3A%5B%7B%22type%22%3A%22is%22%2C%22values%22%3A%5B%7B%22constant%22%3A%22No%22%7D%5D%2C%22id%22%3A0%2C%22error%22%3Afalse%7D%5D%2C%22scheduled_job.created_date%22%3A%5B%7B%22type%22%3A%22past%22%2C%22values%22%3A%5B%7B%22constant%22%3A%221%22%2C%22unit%22%3A%22day%22%7D%2C%7B%7D%5D%2C%22id%22%3A3%2C%22error%22%3Afalse%7D%5D%2C%22scheduled_job.status%22%3A%5B%7B%22type%22%3A%22%3D%22%2C%22values%22%3A%5B%7B%22constant%22%3A%22failure%22%7D%2C%7B%7D%5D%2C%22id%22%3A4%2C%22error%22%3Afalse%7D%5D%7D&dynamic_fields=%5B%5D&origin=share-expanded
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