The requested number of discrete sampling intervals over which data should be saved in the part of the nwtHistoryTable associated with this sampled variable. When this object is modified, the agent should set nwtControlHistoryBucketsGranted as closely to this object as is possible for the particular agent implementation, the local policy, and available resources. If the size of the history is increased, no history data will be lost. If the size of the history is decreased, the oldest samples will be discarded as necessary.