PrefetchRetrieval 
    class PrefetchRetrieval
A complex type that contains settings governing when MediaTailor prefetches ads, and which dynamic variables that MediaTailor includes in the request to the ad decision server.
Types
Properties
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                  The dynamic variables to use for substitution during prefetch requests to the ad decision server (ADS).
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                  Configuration for spreading ADS traffic across a set window instead of sending ADS requests for all sessions at the same time.
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                  The configuration for TPS-based traffic shaping that limits the number of requests to the ad decision server (ADS) based on transactions per second instead of time windows.
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                  Indicates the type of traffic shaping used for prefetch traffic shaping and limiting the number of requests to the ADS at one time.