feat(oversight): redirect performance timeline dashboard

[ramboz]

Summary

• Add a dedicated Redirect Performance timeline page (redirectperf.html) showing redirect duration percentiles (p50/p75) over time as a line chart
• Fix the Redirect Count facet in explorer.html to show clean hop counts (1, 2, 3) instead of raw encoded values (1~53, 1:54) introduced in feat: track external redirect estimates helix-rum-enhancer#516
• Add a Redirect Type facet (internal/external) to both explorer.html and the new redirectperf page
• Enable facet-based filtering on the new page — clicking "internal" or "external" in the Redirect Type facet updates the chart and metrics
• Add drilldown links from explorer Redirect Count and Redirect Type facets to the new redirectperf page

Details

New files

• tools/oversight/redirectperf.html — Dashboard page with standard + redirect-specific key metric cards, Chart.js time-series chart, and redirect facet sidebar
• tools/oversight/charts/redirectperf.js — RedirectPerfChart class extending AbstractChart, with groupBy (time bucketing), defineSeries (hasRedirect, noRedirect, internalRedirect, externalRedirect), updateDataFacets (redirect.type, redirect.count, redirect.source), and draw (p50/p75 redirect duration per time bucket)

Modified files

• tools/oversight/slicer.js:
  • Add redirectDuration series (extracts duration in ms from redirect checkpoint target)
  • Add special handling for cp === 'redirect' in updateDataFacets to override redirect.target with clean hop counts and register redirect.type / redirect.count facets
  • Extend updateFilter to accept dynamically registered facets (key in dataChunks.facetFns) so that redirect.type and redirect.count filtering works — isKnownFacet() from rum-distiller uses a static suffix list that doesn't include type or count
• tools/oversight/explorer.html:
  • Add redirect.type list-facet after existing redirect.target facet
  • Add drilldown="redirectperf.html" to both redirect facets

Redirect checkpoint encoding

The redirect checkpoint encodes data in the event target field:

• <count>:<duration> for internal redirects (: separator)
• <estimate>~<duration> for external redirects (~ separator)

Regex: /^(\d+)([:~])(\d+)$/

Test plan

Tested with www.cox.com (has both internal and external redirects with 1-60+ hops):

• redirectperf.html renders line chart with p50/p75 redirect duration over time
• Key metrics show: Redirected PVs (5m), Median Duration (443ms), % Redirected (30%)
• Redirect Type facet shows "external" (3.6m) and "internal" (1.4m)
• Clicking "internal" filters data: PVs drop to 1.4m, duration to 279ms, visits to 1m
• Clicking "external" filters data: PVs 3.6m, duration 604ms
• Redirect Hops facet shows clean values (1, 2, 3, 4, 5) and filtering works
• Explorer redirect.target facet shows clean hop counts (not raw encoded values)
• Explorer redirect.type facet shows external/internal
• Drilldown arrows on redirect facets navigate to redirectperf.html
• Dark mode theming works
• No regression on cwvperf.html (8908 bundles, 12m visits, no filter issues)
• No console errors

Screenshots

Explorer

Deep Dive

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Commits

• 53fd1e8 ✅ (latest)