Hi Guys, I am tracking the exposure event inside the

trackingCallback

, and here is the code:

trackingCallback: (experiment, result) => {

trackEvent('experiment_viewed', {

experimentId: experiment.key,

variationId: result.key

});

}

My question is: do I need to include the

userId

in this event? If not, how would GrowthBook know which user is exposed to which experiment and variation? Additionally, for other custom events, should I also send the

experimentId

,

variationId

, and

userId

with those events?

You do need a userId in the data warehouse- but most trackers will append this info automatically