AI-generated Key Takeaways
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          Frequency cap keys are a group of fields used for frequency caps, with no more than one frequency cap allowed per key. 
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          The key includes fields for the cap's level, the event type it applies to, the time unit, and the duration in time units. 
A group of fields used as keys for a frequency cap. There can be no more than one frequency cap with the same key.
| Fields | |
|---|---|
| 
 | The level on which the cap is to be applied (for example, ad group ad, ad group). The cap is applied to all the entities of this level. | 
| 
 | The type of event that the cap applies to (for example, impression). | 
| 
 | Unit of time the cap is defined at (for example, day, week). | 
| 
 | 
 Number of time units the cap lasts. |