Hi I see the UI can add multiple experiments for one feature on feature setting page. But growthbook constructor trackingCallback: (experiment, result) only picks up the first experiment and its experiment data. How can one feature see multiple experiment data and results?

The trackingCallback only fires once per unique tracking key. So if you specify different tracking keys for the experiment rules in the UI it should fire twice

Hi I added a different tracking key for the additional experiment on the feature but the growthbook's trackingCallback still only calls the first experiment. I see the signature "trackingCallback? (experiment: Experiment<any>, result: Result<any>) => void; " it seems the parameter only for one experiment?

oh, I think I misunderstood your original question. When figuring out the value of a feature, we step through each rule and the first one that matches gets used. So once a user gets put into an experiment, they skip all of the rest of the rules

Jeremy, Thank you. Is it possible to have measure experiments based on different metrics for a feature ?

yes, you can add as many metrics as you want when analyzing experiment results