This will help in tracing the activity of those users and check if they are active or not in order to reward the Pro channel

• Add a pro_referrer boolean to the metrics index
• Add the referrer guid (already present for signup)
• Wherever we write to the metrics index and have a referrer, write the referrer guid and the boolean if they are a referrer

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Scheduled on the sprint @ramialbatal

unassigned @markeharding

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Rescheduled as it can be done along #1240.

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Wherever we write to the metrics index and have a referrer, write the referrer guid and the boolean if they are a referrer

This is only going to be for signup actions for now, as reading the referrer on every pageview/active metric is going to be too expensive.

We can, however, implement an ever-present referrer meta if absolutely needed.

cc/ @brianhatchet @markeharding

marked the task Add a isProReviewer to the metrics index as completed

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mentioned in merge request !450

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assigned to @benhayward.ben