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Thomas Richter d248cba77f docs(08-03): complete observability verification plan

Tasks completed: 3/3
- Deploy TaskPlanner with ServiceMonitor and verify Prometheus scraping
- Verify critical alert rules exist
- Human verification checkpoint (all OBS requirements verified)

Deviation: Fixed Loki datasource conflict (isDefault collision with Prometheus)

SUMMARY: .planning/phases/08-observability-stack/08-03-SUMMARY.md

2026-02-03 22:45:12 +01:00

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Phase 8 Plan 03: Observability Verification Summary

End-to-end observability verified: Prometheus scraping TaskPlanner metrics, Loki log queries working, dashboards operational

Performance

Duration: 6 min
Started: 2026-02-03T21:38:00Z (approximate)
Completed: 2026-02-03T21:44:08Z
Tasks: 3 (2 auto, 1 checkpoint)
Files modified: 1 (loki-stack ConfigMap patch)

Accomplishments

ServiceMonitor deployed and Prometheus scraping TaskPlanner /metrics endpoint
KubePodCrashLooping alert rule confirmed present in kube-prometheus-stack
Alertmanager running and responsive
Human verified: Grafana TLS working, dashboards showing metrics, Loki log queries returning TaskPlanner logs

Task Commits

Each task was committed atomically:

Task 1: Deploy TaskPlanner with ServiceMonitor and verify Prometheus scraping - 91f91a3 (fix: add release label for Prometheus discovery)
Task 2: Verify critical alert rules exist - no code changes (verification only)
Task 3: Human verification checkpoint - user verified

Plan metadata: pending

Files Created/Modified

loki-stack ConfigMap (in-cluster) - Patched isDefault from true to false to resolve datasource conflict

Decisions Made

Added release: kube-prometheus-stack label to ServiceMonitor to match Prometheus Operator's serviceMonitorSelector
Patched Loki datasource isDefault to false to allow Prometheus as default (Grafana only supports one default)

Deviations from Plan

Auto-fixed Issues

1. [Rule 1 - Bug] Fixed Loki datasource conflict causing Grafana crash

Found during: Task 1 (verifying Grafana accessibility)
Issue: Both Prometheus and Loki datasources had isDefault: true, causing Grafana to crash with "multiple default datasources" error. User couldn't see any datasources.
Fix: Patched loki-stack ConfigMap to set isDefault: false for Loki datasource
Command: kubectl patch configmap loki-stack-datasource -n monitoring --type merge -p '{"data":{"loki-stack-datasource.yaml":"...isDefault: false..."}}'
Verification: Grafana restarted, both datasources now visible and queryable
Committed in: N/A (in-cluster configuration, not git-tracked)

Total deviations: 1 auto-fixed (1 bug) Impact on plan: Essential fix for Grafana usability. No scope creep.

Issues Encountered

ServiceMonitor initially not discovered by Prometheus - resolved by adding release: kube-prometheus-stack label to match selector
Grafana crashing on startup due to datasource conflict - resolved via ConfigMap patch

OBS Requirements Verified

Requirement	Description	Status
OBS-01	Prometheus collects cluster metrics	Verified
OBS-02	Grafana dashboards display cluster metrics	Verified
OBS-03	Loki stores application logs	Verified
OBS-04	Alloy collects and forwards logs	Verified
OBS-05	Grafana can query logs from Loki	Verified
OBS-06	Critical alerts configured (KubePodCrashLooping)	Verified
OBS-07	Grafana TLS via Traefik	Verified
OBS-08	TaskPlanner /metrics endpoint	Verified

User Setup Required

None - all configuration applied to cluster. No external service setup required.

Next Phase Readiness

Phase 8 (Observability Stack) complete
Ready for Phase 9 (Security Hardening) or ongoing operations
Observability foundation established for production monitoring

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

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