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Explain how the headline number relates to GLAM #14

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45beb18
Data: explain how the headline number relates to GLAM
mxinden Jun 16, 2026
428a5de
Data: short inline GLAM caveat on each link instead of a collapsible
mxinden Jun 16, 2026
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3 changes: 2 additions & 1 deletion index.html
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Original file line number Diff line number Diff line change
Expand Up @@ -324,7 +324,8 @@ <h2>what HTTPS records carry in the wild</h2>
<p class="chart-cap">
Source: Firefox Nightly, via
<a href="https://glam.telemetry.mozilla.org/fog/probe/netwerk_happy_eyeballs_https_rr_features/explore">GLAM</a>.
Per-connection estimate reconstructed from GLAM's histograms, so approximate.
Per-connection estimate from GLAM's histograms; GLAM's page defaults to
per-client, so its numbers differ.
</p>
</section>

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10 changes: 6 additions & 4 deletions js/charts.js
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@@ -1,8 +1,10 @@
/* Renders the real-browser numbers from data/glam.json (refreshed on CI from
* GLAM; see scripts/fetch-glam.mjs). Same-origin static file, so no CORS.
*
* Shares are GLAM's "By Client ID" proportion: sample_count[bucket] divided by
* the sum over buckets, per build. That matches what the GLAM UI shows. */
* Shares are per-connection: each bucket's share of the four discovery outcomes,
* from GLAM's non-normalized histogram, averaged over recent builds. GLAM's UI
* defaults to a per-client, per-release view, so it won't show these exact
* numbers (see the "How these numbers relate to GLAM" note on the page). */

// bucket key -> [friendly label, color class]
const BUCKETS = {
Expand Down Expand Up @@ -187,7 +189,7 @@ async function loadGlam() {
if (metricSrc) {
metricSrc.innerHTML =
`Firefox Nightly, via <a href="${d.h3_discovery.explore_url}">GLAM</a>, updated ${when}. ` +
`Approximate per-connection estimate, averaged over recent builds.`;
`Per-connection estimate, averaged over recent builds; GLAM's page defaults to per-client, so its numbers differ.`;
}

const share = d.h3_discovery.share;
Expand Down Expand Up @@ -224,7 +226,7 @@ async function loadGlam() {
src.innerHTML =
`Source: Firefox Nightly, via ` +
`<a href="${d.h3_discovery.explore_url}">GLAM</a>, updated ${when}. ` +
`Per-connection estimate reconstructed from GLAM's histograms and averaged over recent builds, so approximate.`;
`Per-connection estimate from GLAM's histograms, averaged over recent builds; GLAM's page defaults to per-client, so its numbers differ.`;
}
}

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