c6aa762a6c
Tasks completed: 2/2 - Add prom-client and create /metrics endpoint - Add ServiceMonitor to Helm chart SUMMARY: .planning/phases/08-observability-stack/08-01-SUMMARY.md Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
103 lines
3.2 KiB
Markdown
103 lines
3.2 KiB
Markdown
---
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phase: 08-observability-stack
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plan: 01
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subsystem: infra
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tags: [prometheus, prom-client, servicemonitor, metrics, kubernetes, helm]
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# Dependency graph
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requires:
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- phase: 06-deployment
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provides: Helm chart structure and Kubernetes deployment
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provides:
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- Prometheus-format /metrics endpoint
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- ServiceMonitor for Prometheus Operator discovery
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- Default Node.js process metrics (CPU, memory, heap, event loop)
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affects: [08-02, 08-03, observability]
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# Tech tracking
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tech-stack:
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added: [prom-client]
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patterns: [metrics-endpoint, servicemonitor-discovery]
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key-files:
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created:
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- src/lib/server/metrics.ts
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- src/routes/metrics/+server.ts
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- helm/taskplaner/templates/servicemonitor.yaml
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modified:
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- package.json
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- helm/taskplaner/values.yaml
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key-decisions:
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- "Use prom-client default metrics only (no custom metrics for initial setup)"
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- "ServiceMonitor enabled by default in values.yaml"
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patterns-established:
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- "Metrics endpoint: server-side only route returning registry.metrics() with correct Content-Type"
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- "ServiceMonitor: conditional on metrics.enabled, uses selectorLabels for pod discovery"
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# Metrics
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duration: 4min
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completed: 2026-02-03
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---
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# Phase 8 Plan 1: TaskPlanner /metrics endpoint and ServiceMonitor Summary
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**Prometheus /metrics endpoint with prom-client and ServiceMonitor for Prometheus Operator scraping**
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## Performance
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- **Duration:** 4 min
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- **Started:** 2026-02-03T21:04:03Z
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- **Completed:** 2026-02-03T21:08:00Z
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- **Tasks:** 2
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- **Files modified:** 5
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## Accomplishments
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- /metrics endpoint returns Prometheus-format text including process_cpu_seconds_total, nodejs_heap_size_total_bytes
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- ServiceMonitor template renders correctly with selector matching TaskPlanner service
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- Metrics enabled by default in Helm chart (metrics.enabled: true)
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Add prom-client and create /metrics endpoint** - `f60aad2` (feat)
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2. **Task 2: Add ServiceMonitor to Helm chart** - `f2a2893` (feat)
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## Files Created/Modified
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- `src/lib/server/metrics.ts` - Prometheus registry with default Node.js metrics
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- `src/routes/metrics/+server.ts` - GET handler returning metrics in Prometheus format
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- `helm/taskplaner/templates/servicemonitor.yaml` - ServiceMonitor for Prometheus Operator
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- `helm/taskplaner/values.yaml` - Added metrics.enabled and metrics.interval settings
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- `package.json` - Added prom-client dependency
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## Decisions Made
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- Used prom-client default metrics only (CPU, memory, heap, event loop) - no custom application metrics needed for initial observability setup
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- ServiceMonitor enabled by default since metrics endpoint is always available
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## Deviations from Plan
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None - plan executed exactly as written.
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## Issues Encountered
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None - all verification checks passed.
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## User Setup Required
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None - no external service configuration required. The ServiceMonitor will be automatically discovered by Prometheus Operator once deployed via ArgoCD.
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## Next Phase Readiness
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- /metrics endpoint ready for Prometheus scraping
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- ServiceMonitor will be deployed with next ArgoCD sync
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- Ready for Phase 8-02: Promtail to Alloy migration
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---
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*Phase: 08-observability-stack*
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*Completed: 2026-02-03*
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