fix: Keep Ajax payload out of unrelated events

[ptang-nr]

Drops captured AJAX request + payload info from unrelated events (AJAX timeslice metrics, session trace) via a shared params object.

---

Overview

In this PR, we remove assignments to the params object inside storeXHR. It was possibly a legacy mechanism for passing info to the old SPA implementation. Verified these fields are not pulled from params in the consumer. The consumer should be pulling these fields from the AjaxNode/events directly.

Related Issue(s)

NR-582727

Testing

Added component tests for the shape of params in timeslice metrics + session trace, as well as the Ajax event.

Params:

['method', 'status', 'host', 'hostname', 'pathname']

Ajax:

['method', 'status', 'domain', 'path', 'requestSize', 'responseSize', 'type', 'startTime', 
'endTime', 'callbackDuration', 'ajaxRequest.id', 'gql', 'requestQuery', 'requestHeaders', 
'responseHeaders', 'requestBody', 'responseBody']

[github-actions]

Supportability Metric Usage Changes:

No matching changes found

Supportability Metrics .md File Changes:

supportability_metrics.md was changed? false

New supportability metrics require changes to supportability_metrics.md, as well as a new PR to Angler. Please ensure an Angler PR is created and linked to this PR.

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	27.24 kB / 10.2 kB (gzip)	26.8 kB / 10.16 kB (gzip)	-1.63% / -0.43% (gzip)
lite	async-chunk	59.82 kB / 19.99 kB (gzip)	59.6 kB / 19.96 kB (gzip)	-0.36% / -0.14% (gzip)
pro	loader	69.99 kB / 24.32 kB (gzip)	69.55 kB / 24.28 kB (gzip)	-0.64% / -0.19% (gzip)
pro	async-chunk	97.4 kB / 30.85 kB (gzip)	97.07 kB / 30.79 kB (gzip)	-0.34% / -0.18% (gzip)
spa	loader	72.31 kB / 25.05 kB (gzip)	71.86 kB / 24.99 kB (gzip)	-0.62% / -0.23% (gzip)
spa	async-chunk	109.55 kB / 34.07 kB (gzip)	109.22 kB / 34 kB (gzip)	-0.3% / -0.2% (gzip)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.23%. Comparing base (d75f4bf) to head (421908d).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1809      +/-   ##
==========================================
+ Coverage   90.09%   90.23%   +0.14%     
==========================================
  Files         214      215       +1     
  Lines        7852     7988     +136     
  Branches     1669     1704      +35     
==========================================
+ Hits         7074     7208     +134     
- Misses        708      710       +2     
  Partials       70       70              

Flag	Coverage Δ
unit-tests	86.35% <100.00%> (+0.30%)	⬆️

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[github-actions]

Last ran on July 09, 2026 16:38:51 CDT
Checking merge of (421908d) into main (4ae7348)

[ellisong]

LGTM