Change 471257 had a related patch set uploaded (by Dr0ptp4kt; owner: Dr0ptp4kt):
[operations/puppet@production] Add Google Translate X-Analytics tagging

https://gerrit.wikimedia.org/r/471257

Code change looks good. So I understand: given that google translate is proxying requests it seems that it would do requests via a user agent that identifies request as coming from google translate so we would not need the header. Is that not the case?

Thanks for the review. The User-Agent field is that of the end user's device.

Change 471257 merged by BBlack:
[operations/puppet@production] Add Google Translate X-Analytics tagging

https://gerrit.wikimedia.org/r/471257

It's working nicely. Thanks @BBlack @Nuria!

select uri_host, uri_path, x_analytics_map['proxy'], access_method, agent_type, parse_url(referer, 'HOST'), parse_url(referer, 'PATH'), parse_url(referer, 'QUERY'), user_agent, isp_data['organization'], geocoded_data['country_code']
from webrequest
where
year = 2018
and month = 11
and day = 9
and hour = 1
and is_pageview
and x_analytics_map['translationengine'] = 'GT';
...
Fetched: <X> row(s)

To get a sense of proportion, it seems there were 460k of those Google-translated views overall on January 9 - quite a considerable number.

select COUNT(*)
from wmf.webrequest
where
year = 2019
and month = 1
and day = 9
and is_pageview
and x_analytics_map['translationengine'] = 'GT';

OK
_c0
460442

See now also T215093: Aggregate and save the Google Translate Pageview count temporarily