Historical decline in WWW subdomain use?

Analysis
7

@marry to clarify, the post that @imkevdev linked to earlier describes the dataset changes at the end of 2018:

  1. As of 2018_07_01 we started using URLs from the Chrome UX Report (CrUX). We switched mobile URLs to CrUX on 07_15. This increased our coverage from 500K URLs to ~1.3M.
  2. As of 2018_12_01 we have decreased the number of test runs per URL from 3 to 1. The loss of redundancy may affect the reliability of time-based performance metrics but these are not especially useful in synthetic tests. For accurate real-world performance data join with the CrUX dataset. This change reduces the time for the crawl to complete, allowing us to add more URLs.
  3. As of 2018_12_15 we have increased the desktop URLs to all CrUX URLs for desktop (3.9M).
  4. As of 2019_01_01 we are reducing the crawl frequency from semi-monthly to monthly. Combined with the reduced runs per URL, this change will enable us to afford testing the full CrUX corpus for both desktop and mobile. As of this crawl we will increase the mobile URLs to all CrUX URLs for mobile (4.2M).

So the rollout to use all CrUX URLs was applied to desktop on 2018_12_15 and mobile on 2019_01_01.

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