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You said that you can see event data in BigQuery. However your pasted code doesn't have a tracking callback (uses the default console.log). Can you confirm whether you're actually showing data in BQ? In case not, here's an example tracking callback. For NextJS client components, it might look something like:

import { sendGAEvent } from '@next/third-parties/google'

...

const growthbook = new GrowthBook({
  ...
  trackingCallback: (experiment, result) => {
    sendGAEvent({
      event: "experiment_viewed",
      value: {
        experiment_id: experiment.key,
        variation_id: result.key,
      },
    });
  },
  ...
});

Ahh ok, let me try that and see if it’s the missing piece. To confirm this is vital to completing the loop and recording metric data in the GrowthPanel UI (ie. metrics like “clicks”, “pages per user”)? I apologize in advance if this is really straightfoward, I’m a noob when it comes to AB testing. Thanks Bryce.

exactly, the tracking call is how you associate experiment enrollment with those downstream metric events

Thanks Bryce. I’m making progress! So I’ve got the GTM setup, and I can finally see this experiment_viewed event appear in the GTM data layer.

{
  event: "gtm.load",
  gtm: {uniqueEventId: 9, start: 1721959940389},
  value: {experiment_id: "song_play_btn", variation_id: "0"}
}

But for some reason the page_view metrics still arn’t appearing on the GrowthBook experiment. It’s still complaining with No data yet. Make sure your experiment is tracking properly. Do you know if I need to do something with that anonymous_id in the experiment_assignment_table? I’m setting the id in growthbook.setAttributes as the GA4ClientId from the cookie, but is this not correct? Thanks again heaps in advance