Contact emails

akashna...@google.com, lin...@chromium.org, johni...@chromium.org

Explainer

Attribution Reporting with event-level reports 
<https://github.com/WICG/attribution-reporting-api/blob/main/EVENT.md>

Attribution Reporting API with Aggregatable Reports 
<https://github.com/WICG/attribution-reporting-api/blob/main/AGGREGATE.md>

Aggregation Service for the Attribution Reporting API 
<https://github.com/WICG/attribution-reporting-api/blob/main/AGGREGATION_SERVICE_TEE.md>

Specification

https://wicg.github.io/attribution-reporting-api/

Blink component

Internals > AttributionReporting 
<https://bugs.chromium.org/p/chromium/issues/list?q=component:Internals%3EAttributionReporting>

Summary

We are landing the following changes to the Attribution Reporting API 
focused on:

   - 
   
   additional debugging support by supporting new verbose debug reports
   - 
   
   improving privacy & security by adding additional gating to source 
   verbose debug reports
   - 
   
   improving rate limit accounting by separating the attribution count for 
   the two ARA report types
   

Explainer/Spec changes
   
   1. Spec verbose debug report for max channel capacity and max trigger 
   states cardinality 
   <https://github.com/WICG/attribution-reporting-api/pull/1223>
   2. 
   
   Report source reporting origins per site limit explicitly 
   <https://github.com/WICG/attribution-reporting-api/pull/1225>
   3. 
   
   Gate all source verbose debug reports behind cookie access 
   <https://github.com/WICG/attribution-reporting-api/pull/1204>
   4. 
   
   Split attribution rate-limit into separate event & aggregate rate-limits 
   <https://github.com/WICG/attribution-reporting-api/pull/1211>
   

Risks
Interoperability and Compatibility

(1 <https://github.com/WICG/attribution-reporting-api/pull/1223>, 2 
<https://github.com/WICG/attribution-reporting-api/pull/1225>) Additional 
verbose debug reports and (4 
<https://github.com/WICG/attribution-reporting-api/pull/1211>) splitting 
the attribution rate limit into separate limits for event and aggregate are 
fully backwards compatible changes. Feature (3 
<https://github.com/WICG/attribution-reporting-api/pull/1204>) gating all 
source verbose debug reports is a backwards incompatible change because now 
source-destination-limit and source-destination-rate-limit verbose debug 
reports now require the ar_debug cookie to be set at source registration 
time. This is not a major concern because all other current source verbose 
debug signals already require the ar_debug cookie to be set and most 
ad-techs would already be setting this cookie at source registration time.

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

The attribution reporting feature bundle will be supported on all platforms 
with the exception of  Android WebView

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

Yes

Estimated milestones

This feature bundle is anticipated to ship as part of Chrome 125 
<https://chromiumdash.appspot.com/schedule>. 

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5146883686400000

Links to previous Intent discussions

Previous I2S: 

Intent to Ship: Attribution Reporting API 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/2Rmj5V6FSaY>

Intent to Ship: Attribution Reporting features M117 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/nWF61c8xu-M/m/uMmH1ewcAQAJ>

Intent to Ship: Attribution Reporting features M118 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/Mh-mJiyJZFk/m/HlgzpphYBQAJ>

Intent to Ship: Attribution Reporting features M119 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/6e44SBtEtcQ>

Intent to Ship: Attribution Reporting features M120 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/jSk3xpNPzGQ/m/VZPsdYgGCAAJ>

Intent to Ship: Attribution Reporting features M121 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/g9KiC6Rg_mA/m/V679WcWuAQAJ>

Intent to Ship: Attribution Reporting features M123 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/NE7VGke1Bjc/m/bIX00t4CAAAJ>

Intent to Ship: Attribution Reporting features M124 
<https://groups.google.com/a/chromium.org/g/blink-dev/c/aregp1li6xk/m/IhBB2z8tBQAJ>

Thanks,
Akash

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