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# add(_:)

Registers to receive a daily report of app metrics from the metrics manager.

```
func add(_ subscriber: any MXMetricManagerSubscriber)
```

## Parameters

`subscriber`

The object that receives the daily metrics reports. The object must conform to [`MXMetricManagerSubscriber`](/documentation/MetricKit/MXMetricManagerSubscriber).

## Discussion

> Warning:
> If you call this function from a method that deallocates the object, your app might crash.

---

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