[android-components](../../index.md) / [mozilla.components.service.glean](../index.md) / [EventMetricType](index.md) / [allowedExtraKeys](./allowed-extra-keys.md)

# allowedExtraKeys

`val allowedExtraKeys: `[`List`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-list/index.html)`<`[`String`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-string/index.html)`>?` [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/service/glean/src/main/java/mozilla/components/service/glean/EventMetricType.kt#L30)