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I'm curious what the application could be for load testing? Tools like locust and gatling are nice but are still synthetic. I'd love to capture X minutes of traffic, then dupe it Y times and replay it as a more accurate representation of traffic patterns for load testing. Is that a thing?

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not had a chance to properly try yet, but https://goreplay.org/ does exactly what you are asking. Alternatively, in the container world, tools such as Istio (https://istio.io/) allow traffic shadowing - you can duplicate traffic and route it somewhere else

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