
Launching the Configuration Manager admin console, you may sometimes notice a message:

The easiest way not to watch it is to perform an update before the manufacturer's termination of support for the version in question[1].
But how does the management console "know" that we are dealing with such a case?
By analyzing the SQL queries recorded in the smsprov.log, you can identify the query that determines this[2]:
select all SMS_LifecycleDetectedGroups.MainstreamSupportEndDate,SMS_LifecycleDetectedGroups.ExtendedSupportEndDate
from v_LifecycleDetectedGroups AS SMS_LifecycleDetectedGroups
where ((((((SMS_LifecycleDetectedGroups.ScanData0 is not null AND SMS_LifecycleDetectedGroups.ScanData0 N")
AND SMS_LifecycleDetectedGroups.ScanData0 <= N'5.0.9049.1000′) AND SMS_LifecycleDetectedGroups.ScanData1 is not null)
AND SMS_LifecycleDetectedGroups.ScanData1 N") AND SMS_LifecycleDetectedGroups.ScanData1 >= N'5.0.9049.1000′)
AND SMS_LifecycleDetectedGroups.ScanType = 2)
Further analysis must be done on the database server side. Queries reveal their design in the design view (design), including which tables or other views they reference. In turn, the v_LifecycleDetectedGroups view refers to the v_LU_LifecycleProductGroups view, which in turn draws data from the LU_LifecycleProductGroups table.
In this very table we can read the final maintenance dates of the category of interest (ConfigMgr):

The values retrieved from this table determine whether a particular version of Configuration Manager is supported. Subsequent product updates performed from the console will populate the list of versions (not only of ConfigMgr, but also of Windows systems), adding records for future versions.
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[1] Article detailing the end dates of support for each version: https://learn.microsoft.com/en-us/mem/configmgr/core/servers/manage/updates#supported-versions
[2] Version 2103 was tested
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