In Symantec Management Agent UI in Task history for Client Task Agent we can see history for 90 days
While in Task Agent Settings configuration in SMP Console we have configured to keep history up to 7 days:
ITMS 8.7.x
ITMS 8.8
known limitation
This issue has been address in ITMS 8.8.1
ITMS 8.8 : A point fix for ITMS 8.8 is currently available. See KB 400510 "CUMULATIVE POST ITMS 8.8 RTM(GA) POINT FIXES"
Meanwhile, workaround exist to manually create registry key on managed clients to limit the amount of history data to keep
String key "HistoryKeepDays" with the value of days to keep in HKLM\SOFTWARE\Altiris\Altiris Agent\Task Management hive.
And after SMA Agent restart - it would read this registry and would apply the setting to desired amount of days to keep history: