apache/skywalking ? reverse-engineered prompt

Build me an open source monitoring system for cloud apps that helps me see what my services are doing in one place.

I want a clean dashboard where I can view service health, request traces, metrics, logs, and alerts, plus a visual map of how my services connect. It should feel like a real production observability tool for microservices and containers, with support for common telemetry sources like OpenTelemetry and Prometheus, and a way to handle high volume data without falling over.

Please make it easy to start locally, include a demo experience, and wire up sensible defaults so I can see something working right away. If you need current setup details or best practices, look them up online.