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
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Thomas Richter
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.planning/phases/08-observability-stack/08-03-SUMMARY.md
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---
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phase: 08-observability-stack
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plan: 03
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subsystem: infra
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tags: [prometheus, grafana, loki, alertmanager, servicemonitor, observability, kubernetes]
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# Dependency graph
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requires:
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- phase: 08-01
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provides: TaskPlanner /metrics endpoint and ServiceMonitor
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- phase: 08-02
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provides: Grafana Alloy for log collection
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provides:
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- End-to-end verified observability stack
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- Prometheus scraping TaskPlanner metrics
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- Loki log queries verified in Grafana
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- Alerting rules confirmed (KubePodCrashLooping)
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affects: [operations, future-monitoring, troubleshooting]
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# Tech tracking
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tech-stack:
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added: []
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patterns: [datasource-conflict-resolution]
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key-files:
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created: []
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modified:
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- loki-stack ConfigMap (isDefault fix)
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key-decisions:
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- "Loki datasource isDefault must be false when Prometheus is default datasource"
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patterns-established:
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- "Datasource conflict: Only one Grafana datasource can have isDefault: true"
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# Metrics
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duration: 6min
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completed: 2026-02-03
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---
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# Phase 8 Plan 03: Observability Verification Summary
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**End-to-end observability verified: Prometheus scraping TaskPlanner metrics, Loki log queries working, dashboards operational**
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## Performance
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- **Duration:** 6 min
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- **Started:** 2026-02-03T21:38:00Z (approximate)
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- **Completed:** 2026-02-03T21:44:08Z
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- **Tasks:** 3 (2 auto, 1 checkpoint)
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- **Files modified:** 1 (loki-stack ConfigMap patch)
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## Accomplishments
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- ServiceMonitor deployed and Prometheus scraping TaskPlanner /metrics endpoint
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- KubePodCrashLooping alert rule confirmed present in kube-prometheus-stack
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- Alertmanager running and responsive
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- Human verified: Grafana TLS working, dashboards showing metrics, Loki log queries returning TaskPlanner logs
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## Task Commits
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Each task was committed atomically:
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1. **Task 1: Deploy TaskPlanner with ServiceMonitor and verify Prometheus scraping** - `91f91a3` (fix: add release label for Prometheus discovery)
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2. **Task 2: Verify critical alert rules exist** - no code changes (verification only)
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3. **Task 3: Human verification checkpoint** - user verified
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**Plan metadata:** pending
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## Files Created/Modified
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- `loki-stack ConfigMap` (in-cluster) - Patched isDefault from true to false to resolve datasource conflict
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## Decisions Made
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- Added `release: kube-prometheus-stack` label to ServiceMonitor to match Prometheus Operator's serviceMonitorSelector
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- Patched Loki datasource isDefault to false to allow Prometheus as default (Grafana only supports one default)
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## Deviations from Plan
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### Auto-fixed Issues
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**1. [Rule 1 - Bug] Fixed Loki datasource conflict causing Grafana crash**
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- **Found during:** Task 1 (verifying Grafana accessibility)
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- **Issue:** Both Prometheus and Loki datasources had `isDefault: true`, causing Grafana to crash with "multiple default datasources" error. User couldn't see any datasources.
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- **Fix:** Patched loki-stack ConfigMap to set `isDefault: false` for Loki datasource
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- **Command:** `kubectl patch configmap loki-stack-datasource -n monitoring --type merge -p '{"data":{"loki-stack-datasource.yaml":"...isDefault: false..."}}'`
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- **Verification:** Grafana restarted, both datasources now visible and queryable
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- **Committed in:** N/A (in-cluster configuration, not git-tracked)
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---
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**Total deviations:** 1 auto-fixed (1 bug)
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**Impact on plan:** Essential fix for Grafana usability. No scope creep.
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## Issues Encountered
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- ServiceMonitor initially not discovered by Prometheus - resolved by adding `release: kube-prometheus-stack` label to match selector
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- Grafana crashing on startup due to datasource conflict - resolved via ConfigMap patch
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## OBS Requirements Verified
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| Requirement | Description | Status |
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|-------------|-------------|--------|
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| OBS-01 | Prometheus collects cluster metrics | Verified |
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| OBS-02 | Grafana dashboards display cluster metrics | Verified |
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| OBS-03 | Loki stores application logs | Verified |
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| OBS-04 | Alloy collects and forwards logs | Verified |
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| OBS-05 | Grafana can query logs from Loki | Verified |
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| OBS-06 | Critical alerts configured (KubePodCrashLooping) | Verified |
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| OBS-07 | Grafana TLS via Traefik | Verified |
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| OBS-08 | TaskPlanner /metrics endpoint | Verified |
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## User Setup Required
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None - all configuration applied to cluster. No external service setup required.
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## Next Phase Readiness
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- Phase 8 (Observability Stack) complete
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- Ready for Phase 9 (Security Hardening) or ongoing operations
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- Observability foundation established for production monitoring
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---
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*Phase: 08-observability-stack*
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*Completed: 2026-02-03*
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