The Cosmo Analytics Stack is an open-source drop-in replacement for Apollo Federation / Apollo GraphOS, offering self-hosting and deployment on any infrastructure without exceptions. It's designed to provide analytics, monitoring, and tracing for federated GraphQL APIs, using PostgreSQL as the main system of record, Clickhouse for analytics, and Prometheus for metrics and monitoring. The stack is built in a standardized way to ensure ease of use, with support for Docker and Kubernetes deployment. Cosmo also uses OpenTelemetry (OTEL) for distributed tracing and metrics collection, providing a vendor-neutral standard and allowing users to generate traces across all services.