feat(analytics): add aggregate queue-health to the maintainer quality dashboard (#2201)

[dhgoal]

What

Adds an aggregate queue-health slice to the maintainer quality dashboard (Closes #2201): summed open / stale / draft / unlinked PR counts across the maintainer's shaped repos, an open-PR age-bucket distribution, collision-cluster count, and how many repos fall in each burden band.

Surfaces real data — buildMaintainerQualityDashboard already computes a per-repo QueueHealth in its shaping loop but only kept the band; this folds those existing signals into a dashboard-level queueHealth aggregate. Pure in-memory aggregation over data the loop already produces (no new IO). Counts + bands only, never raw scores.

Scope note: the maintainer-quality dashboard shapes PR queue-health (open/stale/draft/unlinked PRs by age + burden band); the operational job-queue DLQ / time-series trend live behind the separate per-repo /outcome-calibration + queue-trend endpoints. This card renders the PR-queue aggregate that this dashboard's data actually supports — happy to fold in a DLQ/trend series as a follow-up if you'd prefer it here.

Changes

Backend (src/services/maintainer-quality-dashboard.ts, +33)

• Accumulate the per-repo QueueHealth.signals (already computed at buildQueueHealth) into a queueHealth aggregate on MaintainerQualityDashboard: openPullRequests / stalePullRequests / draftPullRequests / unlinkedPullRequests / collisionClusters, an ageBuckets distribution, and per-band bandCounts.
• Covered by test/unit/maintainer-quality-dashboard.test.ts (open-PR count matches qualitySignals; bands + age buckets present; public-safe).

Frontend

• queue-health-card.tsx (new) — QueueHealthCard: four count Stats + a severity-colored age-distribution bar + burden-band pills. Reuses AnalyticsCardShell; empty states for a clear queue and an absent field.
• queue-health-card.test.tsx (new) — populated, queue-clear, and absent-field branches.
• maintainer-panel.tsx — optional queueHealth? on the dashboard type + renders the card above the contributor-quality table.

Verification

test/unit/maintainer-quality-dashboard.test.ts green (11 tests); card tests green (3); tsc clean on the changed backend; pure-aggregation diff (+219/−1).

Screenshots

Maintainer quality dashboard, populated and empty, desktop + mobile, light + dark.

State	Desktop (light)	Desktop (dark)	Mobile
Populated	light	dark	mobile
Empty	light	dark	mobile

Closes #2201

[superagent-security]

🚨 Contributor flagged. Click here for more info: Superagent Dashboard

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.33%. Comparing base (19fbd93) to head (b1c2943).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5141   +/-   ##
=======================================
  Coverage   94.32%   94.33%           
=======================================
  Files         472      472           
  Lines       39868    39878   +10     
  Branches    14544    14544           
=======================================
+ Hits        37607    37617   +10     
  Misses       1583     1583           
  Partials      678      678           

Flag	Coverage Δ
shard-1	46.32% <0.00%> (-0.03%)	⬇️
shard-2	34.32% <100.00%> (-0.36%)	⬇️
shard-3	31.07% <0.00%> (-1.00%)	⬇️
shard-4	33.07% <0.00%> (+1.08%)	⬆️
shard-5	33.45% <0.00%> (-0.17%)	⬇️
shard-6	45.23% <100.00%> (+0.32%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/services/maintainer-quality-dashboard.ts	100.00% <100.00%> (ø)

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Warning

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⏸️ Gittensory review result - manual review recommended

_{Review updated: 2026-07-12 07:25:18 UTC}

5 files · 2 AI reviewers · no blockers · readiness 82/100 · CI green · unstable

⏸️ Suggested Action - Manual Review

• Touches a guarded path — held for manual review: This PR changes guardrail-protected path(s): src/services/maintainer-quality-dashboard.ts (matched src/services/**).

Review summary
This adds a pure in-memory aggregation of already-computed per-repo QueueHealth signals into a new queueHealth field on MaintainerQualityDashboard, plus a QueueHealthCard component with populated/clear/absent states. The backend aggregation is straightforward summation with no new I/O, and the accompanying unit test cross-checks openPullRequests against the existing qualitySignals.openPrs for consistency. The frontend component correctly branches on undefined vs. zero-open-PR states and is covered by three tests exercising each branch.

Nits — 6 non-blocking

• queue-health-card.tsx:45 — QueueHealthCard's render body is ~76 lines (flagged by the size-smell scan); consider splitting the age-bar and band-pills sections into small subcomponents for readability.
• The empty-state check in queue-health-card.tsx (`!queueHealth || queueHealth.openPullRequests === 0`) assumes stale/draft/unlinked counts are always subsets of openPullRequests — worth a one-line comment or a defensive check if that invariant isn't guaranteed by buildQueueHealth.
• The PR description notes the linked issue feat(ui): queue-health trend card on the maintainer quality dashboard #2201 title references a 'trend card' while this delivers point-in-time aggregate counts/bands rather than a time-series trend; this is explicitly called out as a scope note with a promised follow-up, so it's a documentation nuance rather than an issue-linkage problem.
• Consider extracting the age-bucket bar and band-pills rendering in queue-health-card.tsx into small named subcomponents to keep QueueHealthCard under typical size thresholds.
• If a future repo can have stale/draft/unlinked PRs without any 'open' PRs in the same window, revisit the zero-open-PRs-as-empty-state heuristic in queue-health-card.tsx.
• Touches a guarded path — held for manual review — A maintainer must review and merge this change.

Flagged checks (non-blocking)

• Contributor trust — Contributor flagged for review

Signal	Result	Evidence
Code review	✅ No blockers	2 reviewers, synthesized
Linked issue	✅ Linked	#2201
Related work	⚠️ 1 scoped overlap	Top overlaps are listed below; lower-confidence bulk is hidden.
Change scope	❌ 8/20	High review scope from cached public metadata (1 linked issue).
Validation posture	✅ 25/25	PR body includes validation/test evidence.
Contributor workload	✅ 10/10	Author activity: 115 registered-repo PR(s), 67 merged, 22 issue(s).
Contributor context	✅ Confirmed Gittensor contributor	dhgoal; Gittensor profile; 115 PR(s), 22 issue(s).
Gate result	⚠️ Not blocking	Advisory; not blocking this PR.
Improvement	✅ Minor	risk: clean · value: minor — Code changes are accompanied by test evidence. LLM value judgment: moderate — The diff cleanly surfaces existing per-repo QueueHealth signals as a new dashboard-level aggregate with matching UI and tests, closing the linked issue without adding new I/O or risk.

Linked issue satisfaction

Not yet addressed
The issue asks for an operational queue-health card (pending/in-flight/stuck/DLQ counts) with a TrendChart over the queue-trend snapshot and a generatedAt/stale indicator, but the PR instead aggregates a completely different metric — PR queue counts (open/stale/draft/unlinked) and age buckets — with no TrendChart usage and no generatedAt/stale flag, as the PR description itself acknowledges by sco

Review context

• Author: dhgoal
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: not available
• Official Gittensor activity: 115 PR(s), 22 issue(s).
• Related work: Titles/paths share 3 meaningful terms. (issue #642, issue #2013)

Contributor next steps

• Review top overlaps.
• Add a concise scope and risk note.
• Check active issues and PRs before submitting.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Change scope = cached public metadata such as size labels, draft state, and review-burden hints.
• Validation posture = whether the PR provides enough public validation/test evidence for maintainer review.
• Contributor workload = public contributor activity and cleanup pressure, not a repo-wide quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

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Visual preview

Route	Viewport	Before (production)	After (this PR's preview)	Diff
/	desktop			—
/	mobile			—

Click any thumbnail to open the full-size screenshot. Before = production · After = this PR's preview deploy.

_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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