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The Metrics Stored tag for the History Store will update as data is written to and pruned from the Rolling History Buffer. 

The In-Order History configuration parameter of the Transmitter will determine whether the data is flushed in-order (synchronously) or asynchronously.


Note

Data stored in the Rolling History Buffer for an In-Memory History Store will not be persisted across a module configuration change, module disable/enable, module restart or power loss. 

Data stored in the Rolling History Buffer for a Disk-Backed History Store will persist across a module configuration change, module disable/enable, module restart or power loss.


  • Enable Rolling History Buffer
    • Enable the Rolling History Buffer to store data in a rolling buffer to cover data loss in a keep alive timeout scenario
  • Rolling History Prune Interval
    • Interval at which to attempt to prune the rolling history buffer in seconds
  • Rolling History Max Age
    • The maximum age allowed of the data in the rolling history buffer in seconds
    • All data older than the Max Age will be pruned at each prune interval
  • Rolling History Prune Quantity (Deprecated in release 4.0.19)

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