Expand production monitoring with full alert coverage for database connections,
Redis memory/connections, container resources, disk usage, service health, and
backup integrity. Add Alertmanager service with Slack routing for critical and
warning alerts, and add automated backup verification to the pg-backup cron
schedule. Update runbook with DR validation procedures and quarterly checklist.
- Expand Prometheus alert rules from 4 to 24 alerts across 7 groups
- Add Alertmanager container (prom/alertmanager:v0.27.0) with Slack routing
- Configure inhibition rules (critical suppresses warning for same service)
- Schedule automated backup verification at 04:00 UTC daily
- Add Alertmanager datasource to Grafana provisioning
- Update runbook with Section 9: DR Validation (automated + manual procedures)
- Add SLACK_WEBHOOK_URL and Grafana vars to .env.example
Co-Authored-By: Paperclip <noreply@paperclip.ing>
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