A/B testing and Conditional Rollout on event params
Currently, Firebase allows A/B testing to be created on the remote config parameter with the optimization metric on any event being fired on the Firebase Analytics. Unfortunately, it does not allow the metric to be one of the event_params sent on that event. This limits us in running refined experiments on certain attributes.
Secondly, A/B testing and conditional rollout do not allow the creation of refined conditions on the basis of event parameters. This limits further in creating rolling out a feature in controlled manner
Ashwini Kumar
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Auriane Desfrere commented
You can create a new event firing based on the parameter values of an existing event, and then using this event as a metric.
However there has ben some problems using those new events as a metric for IOS in the past, that's true.You can also capture the firebase_expX user property, and make comparisons in the event report based on this user attribute and the event parameter you wanted.