GH-16875: Document telemetry (README + User Guide page)#16877
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Add a Privacy & Telemetry section to the README and a Telemetry page under the User Guide, noting opt-out anonymous usage telemetry starting in 3.46.0.12: what is sent (coarse bucketed metrics plus version/OS), what is never sent, and the opt-out switches.
valenad1
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Jun 8, 2026
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valenad1
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Jun 8, 2026
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| ## 9. Privacy & Telemetry |
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…xact, note DNT/Sec-GPC - Drop the inaccurate 'numeric values are always ranges' claim: a small cluster's node count (1-16) is sent exactly; larger clusters are bucketed. - Note that the receiver also honors the W3C DNT: 1 and Sec-GPC: 1 request headers (verified in h2o-3-telemetry app/transport/http.py).
…etry docs The h2o-3-telemetry receiver repo is private, so describing it as open source and telling users to point H2O_TELEMETRY_URL at their own receiver doesn't hold for end users. Remove that paragraph from the README and the User Guide page.
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Part of #16875
User-facing documentation for the opt-out telemetry added in #16876:
h2o-docs/src/product/telemetry.rst), noting it arrives in 3.46.0.12 — what's sent (coarse bucketed metrics + version/OS), what's never sent, and how to opt out (H2O_DISABLE_TELEMETRY/DO_NOT_TRACK/telemetry=False/-Dsys.ai.h2o.telemetry.disabled=true).Wording only — kept separate from the implementation PR so the copy can be reviewed independently.