In Istio environments, tracing issues often arise due to the lack of context propagation, leading to fragmented and incomplete traces. This problem typically occurs because services fail to forward tracing headers, causing each service to generate new traces instead of contributing to a single, unified trace. The traditional solution involves manually adding header propagation to every service, which is not scalable for large, microservice-based architectures. To address this, OpenTelemetry offers a zero-code instrumentation method that seamlessly integrates with Istio to automatically inject tracing libraries and ensure proper context propagation without modifying application code. By deploying an OpenTelemetry Collector instance and configuring the Instrumentation Custom Resource, traces become fully connected, providing comprehensive end-to-end visibility across services. This approach not only simplifies the process by eliminating the need for code changes but also enhances debugging capabilities and scalability, allowing teams to maintain observability across extensive service networks effortlessly.