Fresnel 0.5.0 for MediaWiki (perf testing in CI)

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Fresnel 0.5.0 for MediaWiki (perf testing in CI)

Krinkle
This week Fresnel 0.5.0 was released and deployed to Jenkins.

Highlighted changes:

   - Add support for Mann–Whitney U test. [1] –
   https://phabricator.wikimedia.org/T223977,
   https://en.wikipedia.org/wiki/Mann-Whitney_U_test
   - Switch regression detection from diffStdev to diffMannWhitney (for
   Paint Timing metrics).
   - Update Chromium from 73.0 to 77.0.
   - Enable Gzip for static files in web server behind Fresnel and Quibble.
   – https://gerrit.wikimedia.org/r/539427


I've written a visual guide for how to open Fresnel's performance report in
your Chrome DevTools locally:

👉 https://wikitech.wikimedia.org/wiki/Performance/Fresnel#DevTools

-- Timo Tijhof

Change log and tracking task for Fresnel 0.5.0:
https://github.com/wikimedia/fresnel/blob/0.5.0/CHANGELOG.md
https://phabricator.wikimedia.org/T235195

---------- Forwarded message ---------
From: Timo Tijhof <[hidden email]>
Subject: Fresnel for MediaWiki (performance testing)
Date: Thu, Mar 7, 2019 at 1:10 AM

You may have noticed something called "mediawiki-fresnel" leaving messages
on Gerrit patches for MediaWiki in the past few days, and wondering what
it's all about. Allow me to introduce Fresnel!

Fresnel is an automation tool for measuring and comparing client-side
performance from web pages. Fresnel was developed over the past two
quarters and is now ready for action. [1] [2] [3]

To learn more about how to use it, what it offers, and how it works, check
out:
https://wikitech.wikimedia.org/wiki/Performance/Fresnel

Some feature highlights:


   - ⏱  *Metrics* from Navigation Timing, Paint Timing, and Resource Timing
   APIs.
   - 📊  DevTools *Timeline* from CI recording can be viewed locally in
   Chrome.
   - 🖼  Recordings take a *screenshot* available in build artefacts.
   - 🔥  Scenarios perform a *warmup* and multiple runs for more stable
   metrics.


--
Timo Tijhof

[1] Launch task: https://phabricator.wikimedia.org/T133646
[2] Phabricator project: https://phabricator.wikimedia.org/tag/fresnel/
[3] Task list:
https://phabricator.wikimedia.org/maniphest/query/9w6EAEPPLQ72/#R
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