docs(merge-queue): document metrics drill-down PR list

[samgutentag]

Summary

• Adds a new section to the Metrics and Monitoring page describing the metrics drill-down feature
• Documents how to click a chart data point to view individual PRs for that time range
• Covers filter options: date range, conclusion, impacted targets

Source

• trunk2 PR: https://github.com/trunk-io/trunk2/pull/3539 (Initial metrics drill details page)
• Linear: https://linear.app/trunk/issue/TRUNK-17995/changelog-and-docs-for-metrics-drilling

Test plan

• Preview in GitBook

[trunk-staging-io]

😎 Merged successfully - details.

[claude]

Claude finished @samgutentag's task in 1m 12s —— View job

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PR Review

• Gather context
• Read changed files
• Check CLAUDE.md for repo guidelines
• Review documentation for typos, grammar, and formatting
• Post inline comments for specific issues
• Provide final review summary

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Summary

The PR adds a ### Drill into a metrics data point section with filter documentation. The content is accurate, but there are two issues worth addressing:

Blocking: Duplicate section
The page already has a ### Drill down into metrics section (lines 108–146) that covers the same feature in detail — with screenshots, "Why Drill Down?", "Select Data Points", and "Review the PR List" subsections. The new section is a shorter restatement of the same feature, which will confuse readers and fragment navigation. See inline comment at line 150.

Recommended fix: Move the new #### Filter the PR list content into the existing section (after #### Review the PR List) and drop the redundant wrapper section. The filter information is the genuinely new piece here.

Minor: Capitalization + wording (line 151)

• "Conclusion Count" and "Time in Queue" should be "Conclusion count" and "Time in queue" to match usage elsewhere in the file.
• "that point" → "that selection" (the feature supports drag-ranges, not just single clicks).

See inline comment at line 151 for a suggested replacement.

[samgutentag]

Triage status (2026-05-05): up to date with main. Needs review before merge.

[claude]

Claude finished @samgutentag's task in 1m 25s —— View job

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PR Review

• Gather context
• Read changed files and current diff
• Verify previous review feedback status
• Check for typos, grammar, formatting
• Post inline comments for any new issues
• Provide final review summary

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Summary

The diff to merge-queue/administration/metrics.md has not changed since the prior review on 2026-05-05 (only a main merge commit landed in between), so both previously flagged issues remain. I also noticed one small style consistency nit.

Blocking — duplicate section (line 150)
The new ### Drill into a metrics data point section overlaps the existing ### Drill down into metrics section (lines 108–146). The genuinely new content is the #### Filter the PR list block and the "Back to Health" tip — these should fold into the existing section rather than stand as a parallel h3.

Non-blocking — capitalization + wording (line 152)

• Conclusion Count / Time in Queue → sentence case (Conclusion count, Time in queue) to match the rest of the file.
• that point → that selection to also cover drag-range selections.

Non-blocking — em-dash consistency (lines 160–162)
The new filter bullets use - for the term/definition split, but the adjacent existing section uses —. Worth aligning when restructuring.

Net: content is accurate and the filter info is the right addition — the structural duplication is the one thing that should block merge.
| Branch

[samgutentag]

Verification status (2026-05-07): live

Verified: customers can use this. Ready to publish.

• Eng PR: trunk-io/trunk2#3539 (merged 2026-04-16)
• Linear: TRUNK-17995 (Done, completed 2026-04-22)
• Flag: none (no LaunchDarkly gate found in PR body or diff)
• Signals:
  • Merge commit on main (status: behind, merge intact)
  • No feature flag patterns in PR diff or product code (merge-metrics-pr-list.tsx)
  • Linear ticket is in Done status
  • No follow-up PRs adding filter UI to the PR list page

Branch is up to date with main. Note: original draft documented filter controls that do not exist in the implementation; corrected in 252984e.

[claude]

PR Review

• Gather context (read CLAUDE.md, current diff)
• Read changed file in current state
• Verify whether prior review feedback was addressed
• Check for typos, grammar, formatting
• Post inline comments for any new issues
• Provide final review summary

View job run | Branch

[claude]

Claude finished @samgutentag's task in 1m 37s —— View job

---

PR Review

• Gather context (read CLAUDE.md, current diff)
• Read changed file in current state
• Verify whether prior review feedback was addressed
• Check for typos, grammar, formatting
• Provide final review summary

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Summary

Commit 252984e rewrote the PR. The current diff is now a single 1-line paragraph appended at the end of the existing ### Drill down into metrics section (line 146), not a parallel h3. All prior blocking feedback is resolved:

• ✅ Duplicate ### Drill into a metrics data point section removed — new content folds into the existing section, right after the pr-drill-down-list.png figure and before the hint block.
• ✅ Capitalization issue moot — the rewritten line doesn't reference the chart names, so there's no Conclusion Count / Time in Queue to fix.
• ✅ Em-dash consistency moot — the rewrite is prose, not bullets.

The new content is genuinely additive: it documents the date-range subtitle, the Back to Health link, and the 2,500-PR truncation behavior — useful page-level details that weren't covered by the existing subsections.

Minor prose nit (non-blocking)

The first sentence reads slightly ambiguously:

The PR list page shows the selected date range as a subtitle and a Back to Health link to return to the charts.

A reader scanning quickly could parse "shows … a Back to Health link" as if the link is also rendered as a subtitle. Splitting the sentence (or replacing the second and with , plus) would tighten it. For example:

The PR list page shows the selected date range as a subtitle, plus a **Back to Health** link to return to the charts. If the selection contains more than 2,500 PRs, the list shows the first 2,500 with a notice indicating the total. Narrow the time bucket on the chart to drill into a smaller window.

Not worth blocking on — current phrasing is understandable on a careful read.

Net

Looks good to ship. Content is accurate, placement matches the surrounding section's structure, and prior structural concerns are addressed.
| Branch

[github-actions]

Auto-approved: Claude code review passed.