Contact emailsdmcar...@chromium.org

Explainer
https://github.com/patcg-individual-drafts/private-aggregation-api#limiting-the-number-of-contributions-per-report

Specification
https://github.com/patcg-individual-drafts/private-aggregation-api/pull/164/files

Summary

Enables Shared Storage callers to customize the number of contributions per
Private Aggregation report. This feature enables Shared Storage callers to
configure per-context contribution limits via a new field,
`maxContributions`. Callers set this field to override the default number
of contributions per report — larger and smaller numbers will both be
permitted. Chrome will accept values of `maxContributions` between 1 and
1000 inclusive; larger values will be interpreted as 1000. Due to padding,
the size of each report's payload will be roughly proportional to the
chosen number of contributions per report. We expect that opting into
larger reports will increase the cost of operating the Aggregation Service.
Protected Audience callers will not be affected by this feature. However,
we are planning to add support for customizing the number of contributions
for Protected Audience reports in future features.


Blink componentBlink>PrivateAggregation
<https://issues.chromium.org/issues?q=customfield1222907:%22Blink%3EPrivateAggregation%22>

TAG reviewhttps://github.com/w3ctag/design-reviews/issues/846

TAG review statusDeclined

Risks


Interoperability and Compatibility

None


*Gecko*: No signal (
https://github.com/mozilla/standards-positions/issues/805)

*WebKit*: No signal (
https://github.com/WebKit/standards-positions/issues/189)

*Web developers*: Positive (
https://github.com/patcg-individual-drafts/private-aggregation-api/issues/81
)

*Other signals*:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that
it has potentially high risk for Android WebView-based applications?

None


Debuggability

No new debug capabilities beyond the existing internals page
(chrome://private-aggregation-internals) and debug mode. These capabilities
will reflect the variable number of contributions across payloads.

Will this feature be supported on all six Blink platforms (Windows, Mac,
Linux, ChromeOS, Android, and Android WebView)?

All but WebView


Is this feature fully tested by web-platform-tests
<https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
?Yes

Flag name on about://flagsNone

Finch feature namePrivateAggregationApiMaxContributions

Requires code in //chrome?False

Tracking bughttps://crbug.com/376707230

Launch bughttps://launch.corp.google.com/launch/4357940

Estimated milestones
Shipping on desktop 134
Shipping on Android 134

Anticipated spec changes

Open questions about a feature may be a source of future web compat or
interop issues. Please list open issues (e.g. links to known github issues
in the project for the feature specification) whose resolution may
introduce web compat/interop risk (e.g., changing to naming or structure of
the API in a non-backward-compatible way).
None

Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5189366316793856?gate=5179705727385600

This intent message was generated by Chrome Platform Status
<https://chromestatus.com/>.

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