When you configure a Source transformation to read from a Google Analytics report, you can select the fields from the

Fields

tab in the transformation. The fields represent the metrics and dimensions of the Google Analytics report.

To verify if the field is a metric or a dimension, click the following URL: https://developers.google.com/analytics/devguides/reporting/core/dimsmets#mode=api&cats=user,session

When you use Google Analytics 4 API, ensure that you do not exceed 10 metrics and 9 dimensions in the Google Analytics report.