[BLCCoreStudio]

Summary

Upgrades cloud/grafana from a compact schema-v1 overview into a schema-v3 deep technical reference centered on Grafana's actual role: querying external data systems, transforming results, rendering dashboards and Explore views, and evaluating/routing alerts.

Changes

• distinguish Grafana's own relational control-state database from external telemetry data sources
• explain data-source, panel, visualization, and app plugin boundaries
• document query execution, variable/macro expansion, transformations, panels, dashboards, Explore, and visualization correctness
• cover Prometheus integration including PromQL ownership, exemplars, query cost, and backend responsibility
• add Grafana Alerting evaluation, alert instances, contact points, notification policies, silences/mute timings, and ownership distinctions with data-source-managed rules
• cover provisioning/as-code ownership, dashboard JSON review, authentication, permissions, service accounts, and data-source credential boundaries
• add plugin supply-chain/security guidance and verify the current AGPL-3.0 license
• document HA database topology, backup/recovery, query fan-out, auto-refresh, result-size/browser cost, alert evaluation scaling, and common failure modes
• add dashboard/alert engineering practices, debugging workflows, anti-patterns, operational checklist, and learning path
• add Technology Universe coverage metadata and a meaningful typed relationship to Prometheus
• expand sources to current upstream data-source, dashboard, Explore, alerting, provisioning, permission, plugin, HA, and recovery documentation

Quality bar

The module treats Grafana as an operational query and presentation control plane rather than pretending it owns all observability data. It follows the project's deep-dive standard while preserving edition boundaries between OSS and Enterprise/Cloud functionality.