Throughout my career, observability and monitoring systems have played a very important role in system stability, availability, and scalability when architecting, whether a system handles millions or billions of events per day. Having architected core infrastructure across communication platforms, enterprise compliance pipelines, and high-throughput transaction systems, I have repeatedly seen how background instrumentation can silently become a bottleneck under heavy production load.Telemetry and observability come with their own challenges. Instrumenting telemetry without degrading live business application performance, increasing request latency, or inflating cloud costs is often deprioritized initially but becomes very important as the system scales. Furthermore, it is a much harder problem to solve than processing domain events themselves in production.