1154474 - Add logging/metrics for "unreaderable" pages

Status: RESOLVED WORKSFORME

(Toolkit :: Reader Mode, defect)

Description

[Peter deHaan [:pdehaan]]

I think it'd be super nice if we had some basic, anonymous metrics around URLs that are unparseable by Readability.

Especially the odd cases where we show the Reader View button in the address bar, and then display "Failed to load article from page" (see https://github.com/mozilla/readability/issues/139, for example).

Having a list of pages which we cannot parse would be valuable for finding potential errors in our Readability engine.
Of course, not all pages can or should be parseable, so we could probably create some filter on the server side to ignore results for certain domains.

Comment 1

[:Gijs (he/him)]

https://telemetry.mozilla.org/new-pipeline/dist.html#!cumulative=0&end_date=2016-07-11&keys=__none__!__none__!__none__&max_channel_version=nightly%252F50&measure=READER_MODE_PARSE_RESULT&min_channel_version=null&product=Firefox&sanitize=0&sort_keys=submissions&start_date=2016-07-08&table=0&trim=1&use_submission_date=0

We have approximately a 2% failure rate on Nightly, apparently. I haven't immediately checked other channels, but I don't think we need to do more here right now.