Quoting an ACP e-mail from last year, "VIPS Sick Report for 7 or More Sick Calls in 365 Days. The average FedEx pilot calls in sick about 3½ times per year, so this report identifies pilots that call in at twice the average..."
In other words, if you call in sick 7 or more times in any rolling 365 day period, VIPS will automatically generate a report to management. A report is also generated if you call in sick within 4 hours of the showtime of a trip.