feat: track external redirect estimates

[ramboz]

Use Case

As a marketer, I want to know how redirects impact my performance scores so that I can avoid undesired redirect chains.

Problem

At the moment, the OpTel Explorer only reports on internal redirects, not external ones. We've seen in customer discussions that external redirects could cause major increases to the TTFB that were hard to detect and debug.

Solution

Leveraging the PerformanceNavigationTiming APIs, we can track the time spent on external redirects before we land on the page, and can also estimate the number of redirects accordingly.

Technically, the idea is to track the redirect count and time in the target for the redirect checkpoint:

• <redirectCount>:<redirectTime> for internal redirects
• <estimatedRedirectCount>~<redirectTime> for external redirects

References

adobe/helix-website#1011

See background discussion in https://cq-dev.slack.com/archives/C07198KKQ07/p1761333727781429

Test URL

https://redirect-time-tracking--helix-rum-enhancer--adobe.aem.page/test/fixtures/otsdk-with-banner.html

[aem-code-sync]

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Commits

• f9d6ac6 ✅ (latest)
• a379053 ✅
• 7d36320 ✅
• 8366787 ✅
• 8f490a2 ✅
• 4015e9d ✅

[trieloff]

Do you think it would make sense to move redirect handling into a plugin? I think we get to a page trough redirects on less than 5% of pages.

[adobe-bot]

This PR will trigger a minor release when merged.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

📢 Thoughts on this report? Let us know!

[ramboz]

@trieloff I was able to pick this up and update the code with your recommendations.

Once we have this deployed and live data flowing in, I'll work on updating the OpTel dashboard accordingly.

[aem-code-sync]

	Page	Scores	Audits	Google
📱	/test/fixtures/otsdk-with-banner.html
🖥️	/test/fixtures/otsdk-with-banner.html

[adobe-bot]

🎉 This PR is included in version 2.45.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v2.45.0

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