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badboy merged 2 commits into from
Apr 3, 2025
Merged

Document DST outlier #864

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Document DST outlier
badboy Apr 3, 2025
2304e22
CI: Pin changed-files action
badboy Apr 3, 2025
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2 changes: 1 addition & 1 deletion .github/workflows/build.yml
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Expand Up @@ -36,7 +36,7 @@ jobs:

- name: Get changed files
id: changed-files
uses: tj-actions/changed-files@v41
uses: tj-actions/changed-files@823fcebdb31bb35fdf2229d9f769b400309430d0 # v46.0.3
with:
files: |
README.md
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2 changes: 2 additions & 0 deletions src/concepts/analysis_gotchas.md
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Expand Up @@ -28,6 +28,8 @@ See also [the spreadsheet of notable historic events](https://docs.google.com/sp

When you start to evaluate trends, be aware of events from the past that may invite comparisons with history. Here are a few to keep in mind:

- **Mar 30, 2025** - The number of `metrics` pings from Firefox for Android from Europe is twice the usual, due to the DST change in Europe. Note that this is a twice-yearly one-day occurrence.
- **Mar 9, 2025** - The number of `metrics` pings from Firefox for Android from North America (US & CA) is higher than usual, due to the DST change in North America.
- **Aug 22, 2024** - Adjust is disabled in mobile clients (Firefox Android & Firefox iOS).
- **May 20, 2024 - June 14, 2024** - Excessive Glean database writes degraded Fenix performance on startup, pageload, scrolling, video playback, and possibly other areas. Some metrics were disabled. See [bug 1892230](https://bugzilla.mozilla.org/show_bug.cgi?id=1892230).
- **Apr 18, 2024** - Google began rolling out a new SERP experience on Firefox Android, which impacted standard search metrics. See [the spreadsheet](https://docs.google.com/spreadsheets/d/16Cyx_KBieRdQkSBKolivqpBaK2H-VceN9LEZcL0snHg/edit#gid=0) for more details.
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