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Add Grafana row to the observability services table, Grafana access details (URL, credentials, auto-provisioned datasources, pre-loaded dashboards), and GRAFANA_ADMIN_PASSWORD to the env vars table in DEPLOYMENT.md. Update C4 l2-containers.puml: replace placeholder Grafana entry with pinned image version, expand observability boundary with node_exporter and cadvisor containers, and add Rel() edges for Grafana → Prometheus, Loki, and Tempo. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>