A segment defines the population you wish to monitor.

Entire set - The policy will be based on metrics applied to the entire data population of the model.
All segments - The policy will be based on metrics applied to all of the segments defined for this model and new ones that will be created in the future. Anomalies will be created for each segment.
Specific segment - The policy will be based on those segments you specify. Anomalies will be created for each of the segments defined here.

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