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Thomas Richter c6aa762a6c docs(08-01): complete TaskPlanner metrics and ServiceMonitor plan

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>

2026-02-03 22:07:43 +01:00

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phase, plan, subsystem, tags, requires, provides, affects, tech-stack, key-files, key-decisions, patterns-established, duration, completed

phase

plan

subsystem

tags

requires

provides

affects

tech-stack

key-files

key-decisions

patterns-established

duration

completed

08-observability-stack

infra

prometheus

prom-client

servicemonitor

metrics

kubernetes

helm

phase	provides
06-deployment	Helm chart structure and Kubernetes deployment

Prometheus-format /metrics endpoint

ServiceMonitor for Prometheus Operator discovery

Default Node.js process metrics (CPU, memory, heap, event loop)

08-02

08-03

observability

added

patterns

prom-client

metrics-endpoint

servicemonitor-discovery

created

modified

src/lib/server/metrics.ts

src/routes/metrics/+server.ts

helm/taskplaner/templates/servicemonitor.yaml

package.json

helm/taskplaner/values.yaml

Use prom-client default metrics only (no custom metrics for initial setup)

ServiceMonitor enabled by default in values.yaml

Metrics endpoint: server-side only route returning registry.metrics() with correct Content-Type

ServiceMonitor: conditional on metrics.enabled, uses selectorLabels for pod discovery

4min

2026-02-03

Phase 8 Plan 1: TaskPlanner /metrics endpoint and ServiceMonitor Summary

Prometheus /metrics endpoint with prom-client and ServiceMonitor for Prometheus Operator scraping

Performance

Duration: 4 min
Started: 2026-02-03T21:04:03Z
Completed: 2026-02-03T21:08:00Z
Tasks: 2
Files modified: 5

Accomplishments

/metrics endpoint returns Prometheus-format text including process_cpu_seconds_total, nodejs_heap_size_total_bytes
ServiceMonitor template renders correctly with selector matching TaskPlanner service
Metrics enabled by default in Helm chart (metrics.enabled: true)

Task Commits

Each task was committed atomically:

Task 1: Add prom-client and create /metrics endpoint - f60aad2 (feat)
Task 2: Add ServiceMonitor to Helm chart - f2a2893 (feat)

Files Created/Modified

src/lib/server/metrics.ts - Prometheus registry with default Node.js metrics
src/routes/metrics/+server.ts - GET handler returning metrics in Prometheus format
helm/taskplaner/templates/servicemonitor.yaml - ServiceMonitor for Prometheus Operator
helm/taskplaner/values.yaml - Added metrics.enabled and metrics.interval settings
package.json - Added prom-client dependency

Decisions Made

Used prom-client default metrics only (CPU, memory, heap, event loop) - no custom application metrics needed for initial observability setup
ServiceMonitor enabled by default since metrics endpoint is always available

Deviations from Plan

None - plan executed exactly as written.

Issues Encountered

None - all verification checks passed.

User Setup Required

None - no external service configuration required. The ServiceMonitor will be automatically discovered by Prometheus Operator once deployed via ArgoCD.

Next Phase Readiness

/metrics endpoint ready for Prometheus scraping
ServiceMonitor will be deployed with next ArgoCD sync
Ready for Phase 8-02: Promtail to Alloy migration

Phase: 08-observability-stack Completed: 2026-02-03

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