Erich Blume 6d65e6928c C2: Deploy infrastructure alerting pipeline (#303 )

## Summary

Mikado chain to replace `mise run services-check` with Grafana Unified Alerting backed by ntfy push notifications.

**Design:**
- Grafana Unified Alerting evaluates rules against Prometheus/Loki
- ntfy webhook contact point delivers iOS notifications
- Anti-noise policy: page once per 24h per alert group
- Every alert links to a runbook in `docs/how-to/alerts/`
- services-check eventually queries the alerting API instead of doing its own probes

**Chain (bottom-up):**
1. `configure-grafana-alerting-pipeline` — enable alerting, ntfy contact point, notification policy
2. `first-alert-and-runbook` — end-to-end proof of concept with blackbox probe failure
3. `port-services-check-alerts` — migrate all services-check probes to alert rules + runbooks
4. `refactor-services-check-to-query-alerts` — rewrite services-check to query Grafana API
5. `deploy-infra-alerting` — goal card

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Reviewed-on: #303

2026-03-22 14:52:56 -07:00

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Runbook: PostgreSQL Cluster Unhealthy

Alert name: PostgresClusterUnhealthy

The CNPG collector metrics endpoint is down, indicating the PostgreSQL cluster is not responding.

Affected Services

The blumeops-pg CNPG cluster on indri's minikube runs databases for:

TeslaMate
Authentik (cross-cluster from ringtail)
Immich
Grafana dashboards (TeslaMate datasource)

Diagnostic Steps

Check CNPG cluster status:

kubectl get cluster blumeops-pg -n databases --context=minikube-indri
kubectl get pods -n databases -l cnpg.io/cluster=blumeops-pg --context=minikube-indri

Check pod logs:

kubectl logs -n databases -l cnpg.io/cluster=blumeops-pg --context=minikube-indri --tail=30

Check if pg_isready:
```
pg_isready -h pg.ops.eblu.me -p 5432
```

Check PVC storage:

kubectl get pvc -n databases --context=minikube-indri

Common Causes

Pod crash — OOM, disk full, or configuration error
PVC storage full — check with kubectl exec into the pod and df -h
Minikube issue — if the node is under memory pressure, CNPG pods may be evicted
Network — Caddy L4 proxy (pg.ops.eblu.me) may be misconfigured

Silencing

For planned database maintenance:

Grafana → Alerting → Silences → Create Silence
Match alertname = PostgresClusterUnhealthy

postgresql — CNPG cluster reference
deploy-infra-alerting — Alerting pipeline overview

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