A rule specifying the maximum number of times an ad (or some set of ads) can be shown to a user over a particular time period.

[Proto definition ![GitHub](https://developers.google.com/site-assets/logo-github.svg)](https://github.com/googleapis/googleapis/blob/master/google/ads/googleads/v26/common/frequency_cap.proto)

| Fields ||
|---|---|
| ## `cap` | `int32` Maximum number of events allowed during the time range by this cap. |
| ## `key` | `https://developers.google.com/google-ads/api/reference/rpc/v26/FrequencyCapKey` The key of a particular frequency cap. There can be no more than one frequency cap with the same key. |