Firebase in App Messaging can display same message repeatedly?

Question

I am checking what kind of functions In App Messaging have and how to implement them on iOS.

In firebase documents https://firebase.google.com/docs/in-app-messaging/explore-use-cases, it says 'Congratulate users whenever they level up in your game app by setting a level_up event as a trigger.'

What does it mean 'whenever they level up'? It mean repeating the same Level up message?
Should I send the message associated with the level_up event from firebase console only once and then the message is displayed repeatedly?

Actually I know I can set the freaquency how often it displays the message on firebase console, but I can choose only two options 'only once' or 'one message every x day(s)'.

it doesn't make sense what firebase documents says if the message is displayed one time every day.

This is an example what I wanted to say.
Firebase documents says like it shows the message whenever you press this button?

@IBAction func show(_ sender: Any) {
    InAppMessaging.inAppMessaging().triggerEvent("level_up");
}