Session Date: 2026-02-26
Project: observability-toolkit / quality-metrics-dashboard
Focus: Session telemetry analysis + dashboard features
Session Type: Analysis | Implementation
| Metric | Value |
|---|---|
| Dashboard commit | 18dc332 (+1,812/-64 lines, 15 files) |
| Parent commit | 388c746 |
| Telemetry records analyzed | 1,296 |
| New components | 4 (SessionDetailPage, ConfidencePanel, ProvenancePanel, sessions API) |
| Theme CSS additions | +234 lines |
Executive Summary
This session had two phases. First, a comprehensive telemetry data inventory for session e6e8aa27-a096-45a6-bd36-839803bf6760 — a 27.4-hour backlog implementation session from Feb 20-21. The audit located 1,296 records across 4 data types (578 trace spans, 691 evaluations, 27 logs, 25 user prompts) stored in 6 JSONL files. Analysis revealed 78 unique span attribute keys, 291M cache-read tokens, and a tool correctness score averaging 0.880 across 325 evaluations.
Second, a significant dashboard feature push: KV delta sync with content-hash deduplication and write budgets for Cloudflare free-tier compliance, a full session detail page, sparkline charts on metric cards, pipeline health stats, provenance and confidence panels, and a complete design system refresh with JetBrains Mono/IBM Plex Sans typography.
Phase 1: Session Telemetry Inventory
Data Sources Found
| Type | Files | Records |
|---|---|---|
| Traces | traces-2026-02-{21,22}.jsonl |
578 spans |
| Evaluations | evaluations-2026-02-{21,22}.jsonl |
691 records |
| Logs | logs-2026-02-{21,22}.jsonl |
27 records |
| History | history.jsonl |
25 prompts |
Target Session Profile
- Wall time: 27.4 hours (Feb 20 20:11 - Feb 21 23:34)
- Models: claude-opus-4-6 (15), sonnet-4-6 (2), haiku-4-5 (1)
- Token usage: 37K input, 392K output, 291M cache-read, 16M cache-creation
- Tool calls: 342 builtin (Bash 120, Read 88, Edit 39) + 26 MCP
- Errors: 39 total (23 Edit write_error, 5 Read not_found, 5 Edit permission)
Evaluation Results
| Metric | Count | Avg | Min | Max |
|---|---|---|---|---|
| evaluation_latency | 364 | 0.030s | 0.002s | 3.162s |
| tool_correctness | 325 | 0.880 | 0.000 | 1.000 |
| task_completion | 2 | 0.750 | 0.500 | 1.000 |
Hook Latency Outliers
| Hook | Count | Avg (ms) | Max (ms) |
|---|---|---|---|
| stop-tsc-check | 4 | 40,634 | 53,624 |
| session-start | 3 | 1,834 | 3,162 |
| token-metrics-extraction | 24 | 142 | 528 |
Phase 2: Dashboard Feature Push
KV Delta Sync (scripts/sync-to-kv.ts)
Rewrote the KV sync pipeline to stay under Cloudflare’s free-tier 1,000 writes/day limit:
- Content-hash delta sync: SHA-256 hash comparison skips unchanged entries
- Write budget: Default 450 entries/run with
--budgetflag - Priority bucketing: meta/dashboard > metrics > trends > traces
- State persistence:
.kv-sync-state.jsontracks last-sync hashes - Graceful degradation: Catches KV daily limit errors (code 10048) and defers
Session Detail Page (src/pages/SessionDetailPage.tsx)
New 740-line page providing full session telemetry view:
- Trace listing with duration, status, tool attribution
- Evaluation breakdown with score distributions
- Log records with severity filtering
- Tool usage summary with error rates
- Session timeline visualization
- API route:
GET /api/sessions/:sessionId - Hook:
useSessionDetail.tswith SWR data fetching
Design System Overhaul (src/theme.css)
Complete refresh of the CSS custom property system:
| Aspect | Before | After |
|---|---|---|
| Typography | System fonts | JetBrains Mono + IBM Plex Sans |
| Color palette | GitHub-inspired | Custom dark theme with accent blues |
| CSS variables | 15 | 45+ (spacing, radii, shadows) |
| Status effects | None | Glow shadows for warning/critical |
| Accessibility | None | prefers-reduced-motion support |
New Components
- ConfidencePanel (
src/components/ConfidencePanel.tsx): Displays agreement grid, variance bars, and consensus method for multi-evaluator confidence analysis - ProvenancePanel (
src/components/ProvenancePanel.tsx): Evaluation audit trail with trace/span/session IDs, evaluator metadata, and copy-to-clipboard actions - Sparkline integration on MetricCard: 24-bucket SVG trend lines with status-colored strokes
Dashboard API Enhancements
dashboard.ts:computeSparklineData()buckets evaluations into 24 time bins, returns avg scores per bucket, piped through all role viewsserver.ts: Mounted session routes at/api/sessionssessions.ts: Full CRUD for session telemetry queries via parentdist/backend
Files Modified
Dashboard Submodule (commit 18dc332)
| File | Change |
|---|---|
scripts/sync-to-kv.ts |
+125 KV delta sync |
src/pages/SessionDetailPage.tsx |
+740 new |
src/theme.css |
+234 design system |
src/api/routes/sessions.ts |
+216 new |
src/components/ConfidencePanel.tsx |
+119 new |
src/hooks/useSessionDetail.ts |
+108 new |
src/components/ProvenancePanel.tsx |
+104 new |
src/components/HealthOverview.tsx |
+85 pipeline health |
src/api/routes/dashboard.ts |
+42 sparklines |
src/components/MetricCard.tsx |
+39 sparklines/glow |
src/pages/EvaluationDetailPage.tsx |
+31 provenance |
src/App.tsx |
+21 routing |
src/components/MetricGrid.tsx |
+9 sparkline pass-through |
src/api/server.ts |
+2 session routes |
.gitignore |
+1 kv-sync-state |
References
- Dashboard repo:
quality-metrics-dashboardcommit18dc332 - Parent repo:
env-settingscommit388c746 - Analyzed session:
e6e8aa27-a096-45a6-bd36-839803bf6760 - Telemetry:
~/.claude/telemetry/traces-2026-02-{21,22}.jsonl - Previous session: 2026-02-25 Condense Tools Live Validation