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Added in SQL Server version:
Removed in SQL Server version:
Extended Events wait_type value:
Maps to the CS_MIGRATION_BACKGROUND_TASK map_value in sys.dm_xe_map_values.
The map_key value in sys.dm_xe_map_values is 1213 in 2017 RTM. After 2017 RTM, you must check the DMV to get the latest value as some map_key values have changed in later builds.
Known occurrences in SQL Server (list number matches call stack list):
Abbreviated call stacks (list number matches known occurrences list):