From "dashboard.concurrentUsers" in your question, it looks like you are trying to get data in the " Analytics" tab in your panel.
There is no public API for retrieving analytic data, although you can manually export data to a CSV file from the Firebase console.
What you can do is enable BigQuery integration . This means that all Google Analytics events for Firebase from now on will be recorded in BigQuery, where you can query them. This is the raw data, events recorded by your applications, and not the aggregated data that you find on the toolbar.
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