Learn to identify and resolve timing discrepancies in application monitoring through this conference talk that explores the subtle nuances of request duration measurement in OpenTelemetry instrumentation. Discover why client-reported request durations often don't match server-side measurements and understand the "dark matter" gaps that appear in distributed traces. Examine OpenTelemetry instrumentation approaches across popular programming languages and decode what duration timings in traces and logs actually represent. Explore how the newly donated OpenTelemetry eBPF Instrumentation can augment telemetry data to overcome measurement inaccuracies and provide more accurate observability insights. Gain practical knowledge about common pitfalls in application instrumentation and learn techniques to improve the reliability of your monitoring and tracing systems.