New tab page sponsored image (NTP SI) P3A metrics for users not opted in to rewards

P3A metrics will be dynamically created for each NTP-SI campaign. Views, clicks and landings will be recorded for each campaign.

The name format will be as follows: creativeInstanceId.{campaign id}.{event type}.

These metrics will be reported daily, for up to seven days per campaign. When the metrics are uploaded, the header X-Brave-P3A-Creative will be set to true.

This issue depends on #24318 and #24319 .

[DJAndries]

@GeetaSarvadnya Once the metric has been sent, you should not see the creativeInstanceId-prefixed metric on the local state page (unless you viewed/clicked/landed on the same ad between the time the value was recorded by the P3A system and the time the metric was sent). The header is no longer relevant, only the URL https://p3a-creative.brave.com. I updated the test plan accordingly. In step 5, you should ensure that the metric sent in step 4 is not resent, unless you viewed/clicked/landed on the same ad again.

[GeetaSarvadnya]

Verification PASSED on Samsung Galaxy Tab A7 version 12 running Bravemonoarm64.apk_1.45.121

• Verified the test plan from https://github.com/brave/brave-core/pull/14595

Verify creativeInstanceId when ads rewards is disabled_PASSED

• Confirmed that creativeInstanceId doesn’t exists in brave://local-state when ads and rewards is disabled

Verify creative metric with the suffix views_PASSED

• Clean profile 1.46.x
• Open brave://local-state file
• Open NTP until NTP SI is shown
• Reload the brave://local-state file
• Confirmed that one creative metric with the suffix views exists in the local state page

Example	Example

Verify creative metric with the suffix clicks_PASSED

• Clean profile 1.46.x
• Open brave://local-state file
• Open NTP until NTP SI is shown
• Reload the brave://local-state file
• Confirmed that one creative metric with the suffix views exists in the local state page
• Click on the creative (NTP SI)
• Confirmed that one creative metric with the suffix clicks exists in the local state page

Example	Example	Example

Verify creative metrics are sent to the endpoint https://p3a-creative.brave.com_PASSED

• Clean profile 1.46.x
• Open brave://local-state file
• Open NTP until NTP SI is shown
• Reload the brave://local-state file
• Confirmed that one creative metric with the suffix views exists in the local state page
• Click on the creative (NTP SI) and stay on the landing page for 10 secs
• Confirmed that one creative metric with the suffix clicks and lands exists in the local state page

Example	Example	Example

• Close the browser
• Set the sys date ahead by one day
• Open charles proxy
• Relaunch the browser and ensured creative metrics are sent to the endpoint https://p3a-creative.brave.com

View	Click	Land

• Open brave://local-state file and ensured creative metrics are NOT shown in local-state file

• Close browser, advance the time by one day, open browser, ensure the metrics are not resent.

brave://local-state	https://p3a-creative.brave.com