Grafana is an open-source platform for building dashboards that visualize metrics, logs, and traces in real-time. Advanced practitioners craft multi-data-source dashboards that integrate Prometheus (metrics), Elasticsearch (logs), Jaeger (traces), and cloud platforms (AWS, Azure, GCP). They optimize query performance, design alerts that actually trigger on meaningful events, and enable teams to move from reactive firefighting to proactive prediction. Advanced Grafana includes dashboard-as-code practices (using Jsonnet, Helm, or Terraform), multi-tenancy setups, custom plugins, and integration with incident management systems (PagerDuty, Opsgenie).