?source=addon and ?source=firefox on the account creation URL should suffice, and be ignored by the server. Metrics will need to only count HTTP 200 responses for these stats.
I don't think we care about measuring this anymore.
Status: NEW → RESOLVED
Last Resolved: 7 years ago
Resolution: --- → WONTFIX
Component: Firefox Sync: Backend → Sync
Product: Cloud Services → Firefox
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