Hello,

  Use Counters[0] as reported by the Telemetry Aggregator (via the HTTPS
API, and the aggregates dashboards on telemetry.mozilla.org) have been
over-reporting usage since bug 1204994[1] (about the middle of September,
2015). They are now fixed [2], and in the course of fixing it, :gfritzsche
prepared a nifty view [3] of them that performs the fix client-side.

  Of all the problems to have with use-counters, _over_estimating usage is
the kind of problem that hurts the web least, as at least we weren't
retiring features that were used more than we reported.

  For a narrative-form description of the events, I wrote this blog post:
[4]. In short, we goofed. But it's fixed now, and the aggregator (and,
thus, telemetry.mozilla.org's telemetry aggregates dashboards) now report
the correct values for all queries, current and historical.

  So go forth and enjoy your use counters! They're pretty neat, actually.

:chutten

[0]:
https://firefox-source-docs.mozilla.org/toolkit/components/telemetry/telemetry/collection/use-counters.html
[1]: https://bugzilla.mozilla.org/show_bug.cgi?id=1204994
[2]: https://github.com/mozilla/python_mozaggregator/pull/59
[3]: http://georgf.github.io/usecounters/index.html
[4]:
https://chuttenblog.wordpress.com/2018/01/17/firefox-telemetry-use-counters-over-estimating-usage-now-fixed/
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