OpenTelemetry is an open-source observability framework for cloud-native service and infrastructure instrumentation hosted by the Cloud Native Computing Foundation (CNCF). The demo application, a password generator overdesigned as a microservices application, demonstrates how to instrument code with OpenTelemetry to generate traces. Traces represent a sequence of operations that were performed across all microservices involved in order to fulfill an individual request. With Promscale, Grafana, and SQL, users can analyze data across all services, per service, or per operation to compute the three golden signals: throughput, latency, and error rate. The node graph panel allows for visualization of upstream and downstream dependencies between services and operations, enabling analysis of how services interact with each other. By interrogating trace data in any way needed, users can quickly derive new insights about their distributed systems, helping them surface and identify hard-to-find problems that would require a lot of manual work to find with other tools.