See parent task for details.
Initially, the output should specify the ratios as:
1. Number of user pageviews associated with Wikimedia search divided by each of the following
2. Number of user pageviews associated with external search (by way of the `referer_data` field of `webrequest`; bonus points for breakout by `referer_name` when it is external search-based) divided by each of the following
3. Number of Related Articles fetches via the edge (mobile web only) divided by the following (n.b. this will serve as a good-enough proxy for impressions for now)
**Preferred:**
- internally referred daily pageviews
- inferred monthly users, based on `pageview_actor` hashing approach
- inferred daily users, based on `pageview_actor` hashing approach
- estimated daily unique devices, based on `unique_devices_per_domain_monthly`
- total daily user pageviews
**And if queries will run successfully:**
- internally referred monthly pagviews
- estimated monthly unique devices, based on `unique_devices_per_domain_monthly`
- total monthly user pageviews