For logging to work:
1. $wgWMEStatsdBaseUri needs to point to a valid statsv endpoint,
e.g. 'https://en.wikipedia.org/beacon/statsv'.
2. $wgPopupsStatsvSamplingRate needs to be set. Note that the codebase
already contains the EventLogging functionality, which is configured
separately. Separately configuring different logging mechanisms
allows us to avoid sampling mistakes that may arise while choosing
one or the other. For example, let's say we want to use EventLogging for
10% of users and statsv for 5%. We'd sample all users into two
buckets: 50/50. And then we'd have to set the sampling rates as
20% and 10% respectively, only because of the bucketing above. To avoid
this kind of complications, separate sampling rates are used for each
logging mechanism. This, of course, may result in situations where a
session is logged via both EventLogging and statsv.
3. The WikimediaEvents extension needs to be installed. The extension
adds the `ext.wikimediaEvents` module to the output page. The
logging functionality is delegated to this module.
Notable changes:
* The FETCH_START and FETCH_END actions are converted to a timed action.
* The experiments stub used in tests has been extracted to the stubs
file.
Logged data is visualized at
https://grafana.wikimedia.org/dashboard/db/reading-web-page-previews
Bug: T157111
Change-Id: If3f1a06f1f623e8e625b6c30a48b7f5aa9de24db
The render change listener is hard coupled to the renderer file, so in
order to migrate the test, instead of stubbing a global variable, we had
to either inject the renderer into the change listener factory as done
everywhere else, or mock the require call.
In order to do one thing per commit, we're mocking the require call
here to get the migration done, but added a FIXME to use dependency
injection instead in a future change.
Change-Id: I50f82cdc9664d34b8a8ccc1ff368f7209404159d
Given this is a jsdom environment assertions using jQuery's :visible
have been changed to check the display property for visibility.
See https://github.com/tmpvar/jsdom/issues/1048
Change-Id: Ifad8067c0b50053a94ac977ee1f1f5a3066bfa16
And on the way there actually put it in a changeListeners/ folder and
rename it to eventLogging.test.js
Change-Id: I60685021841b44f606f39b07bf7f5262344262f4
